diff --git a/backend/python/acquisition.py b/backend/python/acquisition.py
new file mode 100644
index 0000000..7dc421f
--- /dev/null
+++ b/backend/python/acquisition.py
@@ -0,0 +1,35 @@
+import numpy as np
+
+class AcquisitionModule:
+    def __init__(self, rgb_shape=(480, 640, 3), depth_shape=(480, 640)):
+        self.rgb_shape = rgb_shape
+        self.depth_shape = depth_shape
+
+    def get_frames(self):
+        """
+        Simulates fetching RGB and depth frames and saves them to .npy files.
+        Returns the filepaths of the saved frames.
+        """
+        rgb_frame = np.random.randint(0, 256, size=self.rgb_shape, dtype=np.uint8)
+        depth_frame = np.random.rand(*self.depth_shape).astype(np.float32) * 1000  # Simulate depth in mm
+
+        rgb_filepath = "temp_rgb.npy"
+        depth_filepath = "temp_depth.npy"
+
+        np.save(rgb_filepath, rgb_frame)
+        np.save(depth_filepath, depth_frame)
+
+        return rgb_filepath, depth_filepath
+
+if __name__ == '__main__':
+    # Example usage
+    acquisition_module = AcquisitionModule()
+    rgb_path, depth_path = acquisition_module.get_frames()
+    print("RGB frame saved to:", rgb_path)
+    print("Depth frame saved to:", depth_path)
+
+    # Verify by loading
+    loaded_rgb = np.load(rgb_path)
+    loaded_depth = np.load(depth_path)
+    print("Loaded RGB Frame Shape:", loaded_rgb.shape)
+    print("Loaded Depth Frame Shape:", loaded_depth.shape)
diff --git a/backend/python/data_management.py b/backend/python/data_management.py
new file mode 100644
index 0000000..0240047
--- /dev/null
+++ b/backend/python/data_management.py
@@ -0,0 +1,110 @@
+import json
+import os
+
+class PatientDataManager:
+    def __init__(self, data_file_path="patient_data.json"):
+        self.data_file_path = data_file_path
+        self.patient_data = {}
+        self.load_data()
+
+    def add_patient_record(self, patient_id, patient_name, scan_data_reference):
+        """Adds a new patient record."""
+        if patient_id in self.patient_data:
+            print(f"Warning: Patient ID {patient_id} already exists. Overwriting.")
+        self.patient_data[patient_id] = {
+            "name": patient_name,
+            "scan_data_reference": scan_data_reference
+        }
+        print(f"Record added for patient ID {patient_id}.")
+
+    def get_patient_record(self, patient_id):
+        """Retrieves a patient record by patient_id."""
+        return self.patient_data.get(patient_id, None)
+
+    def save_data(self):
+        """Saves the current patient data to the JSON file."""
+        try:
+            with open(self.data_file_path, 'w') as f:
+                json.dump(self.patient_data, f, indent=4)
+            print(f"Data saved to {self.data_file_path}")
+        except IOError as e:
+            print(f"Error saving data to {self.data_file_path}: {e}")
+
+    def load_data(self):
+        """Loads patient data from the JSON file if it exists."""
+        if not os.path.exists(self.data_file_path):
+            print(f"Data file {self.data_file_path} not found. Starting with empty data.")
+            self.patient_data = {}
+            return
+
+        try:
+            with open(self.data_file_path, 'r') as f:
+                self.patient_data = json.load(f)
+            print(f"Data loaded from {self.data_file_path}")
+        except IOError as e:
+            print(f"Error loading data from {self.data_file_path}: {e}. Starting with empty data.")
+            self.patient_data = {}
+        except json.JSONDecodeError as e:
+            print(f"Error decoding JSON from {self.data_file_path}: {e}. Starting with empty data.")
+            self.patient_data = {}
+
+if __name__ == "__main__":
+    print("Starting PatientDataManager Test Suite...")
+    test_file = "test_patient_data.json"
+
+    # Clean up before test, if file exists from a previous failed run
+    if os.path.exists(test_file):
+        os.remove(test_file)
+
+    # 1. Create an instance of PatientDataManager
+    print("\nStep 1: Creating first PatientDataManager instance...")
+    manager1 = PatientDataManager(data_file_path=test_file)
+
+    # 2. Add a few patient records
+    print("\nStep 2: Adding patient records...")
+    manager1.add_patient_record("P001", "John Doe", "scan_ref_001.stl")
+    manager1.add_patient_record("P002", "Jane Smith", "scan_ref_002.stl")
+    manager1.add_patient_record("P003", "Alice Brown", "/path/to/scan_003.npy")
+
+    # Verify records in manager1
+    print("\nVerifying records in manager1:")
+    print("Record P001:", manager1.get_patient_record("P001"))
+    print("Record P002:", manager1.get_patient_record("P002"))
+
+    # 3. Save the data
+    print("\nStep 3: Saving data...")
+    manager1.save_data()
+
+    # 4. Create another instance of PatientDataManager (simulating loading from the file)
+    print("\nStep 4: Creating second PatientDataManager instance to load data...")
+    manager2 = PatientDataManager(data_file_path=test_file)
+
+    # 5. Retrieve and print the records to verify they were saved and loaded correctly
+    print("\nStep 5: Retrieving and verifying records from manager2...")
+    record_p001_loaded = manager2.get_patient_record("P001")
+    record_p002_loaded = manager2.get_patient_record("P002")
+    record_p003_loaded = manager2.get_patient_record("P003")
+
+    print("Loaded Record P001:", record_p001_loaded)
+    print("Loaded Record P002:", record_p002_loaded)
+    print("Loaded Record P003:", record_p003_loaded)
+
+    assert record_p001_loaded is not None and record_p001_loaded["name"] == "John Doe"
+    assert record_p002_loaded is not None and record_p002_loaded["scan_data_reference"] == "scan_ref_002.stl"
+    assert record_p003_loaded is not None and record_p003_loaded["name"] == "Alice Brown"
+
+    # Test getting a non-existent record
+    print("\nTesting retrieval of a non-existent record (P004):")
+    non_existent_record = manager2.get_patient_record("P004")
+    print("Record P004:", non_existent_record)
+    assert non_existent_record is None
+
+    # 6. Clean up by removing the test_patient_data.json file
+    print("\nStep 6: Cleaning up test file...")
+    if os.path.exists(test_file):
+        os.remove(test_file)
+        print(f"Removed test file: {test_file}")
+    else:
+        print(f"Test file {test_file} not found for cleanup.")
+
+    print("\nPatientDataManager Test Suite Completed Successfully!")
diff --git a/backend/python/requirements.txt b/backend/python/requirements.txt
new file mode 100644
index 0000000..24ce15a
--- /dev/null
+++ b/backend/python/requirements.txt
@@ -0,0 +1 @@
+numpy
diff --git a/backend/rust/mock_rust_runner.py b/backend/rust/mock_rust_runner.py
new file mode 100644
index 0000000..aa8ec96
--- /dev/null
+++ b/backend/rust/mock_rust_runner.py
@@ -0,0 +1,11 @@
+import sys
+
+if __name__ == "__main__":
+    if len(sys.argv) == 3:
+        rgb_path = sys.argv[1]
+        depth_path = sys.argv[2]
+        # Simulate the Rust executable's output format
+        print(f"Processed 3D model from {rgb_path} and {depth_path}")
+    else:
+        print("Usage: python mock_rust_runner.py <rgb_path> <depth_path>", file=sys.stderr)
+        sys.exit(1)
diff --git a/backend/rust/reconstruction_engine/Cargo.lock b/backend/rust/reconstruction_engine/Cargo.lock
new file mode 100644
index 0000000..9223f12
--- /dev/null
+++ b/backend/rust/reconstruction_engine/Cargo.lock
@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "reconstruction_engine"
+version = "0.1.0"
diff --git a/backend/rust/reconstruction_engine/Cargo.toml b/backend/rust/reconstruction_engine/Cargo.toml
new file mode 100644
index 0000000..f6f7c68
--- /dev/null
+++ b/backend/rust/reconstruction_engine/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "reconstruction_engine"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
diff --git a/backend/rust/reconstruction_engine/src/lib.rs b/backend/rust/reconstruction_engine/src/lib.rs
new file mode 100644
index 0000000..cf143d9
--- /dev/null
+++ b/backend/rust/reconstruction_engine/src/lib.rs
@@ -0,0 +1,70 @@
+pub fn reconstruct_from_frames(rgb_path: &str, depth_path: &str) -> String {
+    // Simulate reading and processing the frame data from the paths.
+    println!("Reading RGB frame from path: {}", rgb_path);
+    println!("Reading depth frame from path: {}", depth_path);
+
+    // Simulate some complex 3D reconstruction logic using the data from paths
+    // In a real application, you would use libraries to load .npy files or other image formats.
+    // For this mock, we just acknowledge the paths.
+
+    format!("Processed 3D model from {} and {}", rgb_path, depth_path)
+}
+
+pub fn simplify_mesh(mesh_data: &str) -> String {
+    // In a real scenario, this function would perform mesh simplification algorithms.
+    // For this mock, we'll just prepend "Simplified ".
+    format!("Simplified {}", mesh_data)
+}
+
+pub fn smooth_mesh(mesh_data: &str) -> String {
+    // In a real scenario, this function would perform mesh smoothing algorithms.
+    // For this mock, we'll just prepend "Smoothed ".
+    format!("Smoothed {}", mesh_data)
+}
+
+pub fn export_to_stl(mesh_data: &str, filepath: &str) -> String {
+    // In a real scenario, this function would handle the STL file creation and writing.
+    // For this mock, we simulate the confirmation message.
+    format!("Exported {} to {}.stl", mesh_data, filepath)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn it_works() {
+        let result = 2 + 2;
+        assert_eq!(result, 4);
+    }
+
+    #[test]
+    fn test_reconstruct_from_frames() {
+        let rgb_path = "dummy_rgb.png";
+        let depth_path = "dummy_depth.png";
+        let expected_output = format!("Processed 3D model from {} and {}", rgb_path, depth_path);
+        assert_eq!(reconstruct_from_frames(rgb_path, depth_path), expected_output);
+    }
+
+    #[test]
+    fn test_simplify_mesh() {
+        let mesh_data = "raw_model_data";
+        let expected_output = "Simplified raw_model_data";
+        assert_eq!(simplify_mesh(mesh_data), expected_output);
+    }
+
+    #[test]
+    fn test_smooth_mesh() {
+        let mesh_data = "simplified_model_data";
+        let expected_output = "Smoothed simplified_model_data";
+        assert_eq!(smooth_mesh(mesh_data), expected_output);
+    }
+
+    #[test]
+    fn test_export_to_stl() {
+        let mesh_data = "final_model_data";
+        let filepath = "/path/to/model_output";
+        let expected_output = "Exported final_model_data to /path/to/model_output.stl";
+        assert_eq!(export_to_stl(mesh_data, filepath), expected_output);
+    }
+}
diff --git a/backend/rust/reconstruction_engine/target/.rustc_info.json b/backend/rust/reconstruction_engine/target/.rustc_info.json
new file mode 100644
index 0000000..d4ea511
--- /dev/null
+++ b/backend/rust/reconstruction_engine/target/.rustc_info.json
@@ -0,0 +1 @@
+{"rustc_fingerprint":7337126974762140843,"outputs":{"15729799797837862367":{"success":true,"status":"","code":0,"stdout":"___\nlib___.rlib\nlib___.so\nlib___.so\nlib___.a\nlib___.so\n/usr\noff\npacked\nunpacked\n___\ndebug_assertions\npanic=\"unwind\"\nproc_macro\ntarget_arch=\"x86_64\"\ntarget_endian=\"little\"\ntarget_env=\"gnu\"\ntarget_family=\"unix\"\ntarget_feature=\"fxsr\"\ntarget_feature=\"sse\"\ntarget_feature=\"sse2\"\ntarget_has_atomic=\"16\"\ntarget_has_atomic=\"32\"\ntarget_has_atomic=\"64\"\ntarget_has_atomic=\"8\"\ntarget_has_atomic=\"ptr\"\ntarget_os=\"linux\"\ntarget_pointer_width=\"64\"\ntarget_vendor=\"unknown\"\nunix\n","stderr":""},"4614504638168534921":{"success":true,"status":"","code":0,"stdout":"rustc 1.75.0 (82e1608df 2023-12-21) (built from a source tarball)\nbinary: rustc\ncommit-hash: 82e1608dfa6e0b5569232559e3d385fea5a93112\ncommit-date: 2023-12-21\nhost: x86_64-unknown-linux-gnu\nrelease: 1.75.0\nLLVM version: 17.0.6\n","stderr":""}},"successes":{}}
\ No newline at end of file
diff --git a/backend/rust/reconstruction_engine/target/CACHEDIR.TAG b/backend/rust/reconstruction_engine/target/CACHEDIR.TAG
new file mode 100644
index 0000000..20d7c31
--- /dev/null
+++ b/backend/rust/reconstruction_engine/target/CACHEDIR.TAG
@@ -0,0 +1,3 @@
+Signature: 8a477f597d28d172789f06886806bc55
+# This file is a cache directory tag created by cargo.
+# For information about cache directory tags see https://bford.info/cachedir/
diff --git a/backend/rust/reconstruction_engine/target/debug/.cargo-lock b/backend/rust/reconstruction_engine/target/debug/.cargo-lock
new file mode 100644
index 0000000..e69de29
diff --git a/backend/rust/reconstruction_engine/target/debug/.fingerprint/reconstruction_engine-da6ae83cfbdab3ea/dep-test-lib-reconstruction_engine b/backend/rust/reconstruction_engine/target/debug/.fingerprint/reconstruction_engine-da6ae83cfbdab3ea/dep-test-lib-reconstruction_engine
new file mode 100644
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diff --git a/backend/rust/reconstruction_engine/target/debug/.fingerprint/reconstruction_engine-da6ae83cfbdab3ea/invoked.timestamp b/backend/rust/reconstruction_engine/target/debug/.fingerprint/reconstruction_engine-da6ae83cfbdab3ea/invoked.timestamp
new file mode 100644
index 0000000..e00328d
--- /dev/null
+++ b/backend/rust/reconstruction_engine/target/debug/.fingerprint/reconstruction_engine-da6ae83cfbdab3ea/invoked.timestamp
@@ -0,0 +1 @@
+This file has an mtime of when this was started.
\ No newline at end of file
diff --git a/backend/rust/reconstruction_engine/target/debug/.fingerprint/reconstruction_engine-da6ae83cfbdab3ea/test-lib-reconstruction_engine b/backend/rust/reconstruction_engine/target/debug/.fingerprint/reconstruction_engine-da6ae83cfbdab3ea/test-lib-reconstruction_engine
new file mode 100644
index 0000000..11b6c87
--- /dev/null
+++ b/backend/rust/reconstruction_engine/target/debug/.fingerprint/reconstruction_engine-da6ae83cfbdab3ea/test-lib-reconstruction_engine
@@ -0,0 +1 @@
+00b467c6ee7f0562
\ No newline at end of file
diff --git a/backend/rust/reconstruction_engine/target/debug/.fingerprint/reconstruction_engine-da6ae83cfbdab3ea/test-lib-reconstruction_engine.json b/backend/rust/reconstruction_engine/target/debug/.fingerprint/reconstruction_engine-da6ae83cfbdab3ea/test-lib-reconstruction_engine.json
new file mode 100644
index 0000000..3115f73
--- /dev/null
+++ b/backend/rust/reconstruction_engine/target/debug/.fingerprint/reconstruction_engine-da6ae83cfbdab3ea/test-lib-reconstruction_engine.json
@@ -0,0 +1 @@
+{"rustc":12047664292709028906,"features":"[]","target":6295730984014464461,"profile":15632368228915330634,"path":17523903030608720598,"deps":[],"local":[{"CheckDepInfo":{"dep_info":"debug/.fingerprint/reconstruction_engine-da6ae83cfbdab3ea/dep-test-lib-reconstruction_engine"}}],"rustflags":[],"metadata":7797948686568424061,"config":2202906307356721367,"compile_kind":0}
\ No newline at end of file
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new file mode 100644
index 0000000..e00328d
--- /dev/null
+++ b/backend/rust/reconstruction_engine/target/debug/.fingerprint/reconstruction_engine-e0d1765e110eb1e5/invoked.timestamp
@@ -0,0 +1 @@
+This file has an mtime of when this was started.
\ No newline at end of file
diff --git a/backend/rust/reconstruction_engine/target/debug/.fingerprint/reconstruction_engine-e0d1765e110eb1e5/lib-reconstruction_engine b/backend/rust/reconstruction_engine/target/debug/.fingerprint/reconstruction_engine-e0d1765e110eb1e5/lib-reconstruction_engine
new file mode 100644
index 0000000..4482375
--- /dev/null
+++ b/backend/rust/reconstruction_engine/target/debug/.fingerprint/reconstruction_engine-e0d1765e110eb1e5/lib-reconstruction_engine
@@ -0,0 +1 @@
+daf3f54bb5ff0f4f
\ No newline at end of file
diff --git a/backend/rust/reconstruction_engine/target/debug/.fingerprint/reconstruction_engine-e0d1765e110eb1e5/lib-reconstruction_engine.json b/backend/rust/reconstruction_engine/target/debug/.fingerprint/reconstruction_engine-e0d1765e110eb1e5/lib-reconstruction_engine.json
new file mode 100644
index 0000000..91c182a
--- /dev/null
+++ b/backend/rust/reconstruction_engine/target/debug/.fingerprint/reconstruction_engine-e0d1765e110eb1e5/lib-reconstruction_engine.json
@@ -0,0 +1 @@
+{"rustc":12047664292709028906,"features":"[]","target":6295730984014464461,"profile":11597332650809196192,"path":17523903030608720598,"deps":[],"local":[{"CheckDepInfo":{"dep_info":"debug/.fingerprint/reconstruction_engine-e0d1765e110eb1e5/dep-lib-reconstruction_engine"}}],"rustflags":[],"metadata":7797948686568424061,"config":2202906307356721367,"compile_kind":0}
\ No newline at end of file
diff --git a/backend/rust/reconstruction_engine/target/debug/deps/libreconstruction_engine-e0d1765e110eb1e5.rlib b/backend/rust/reconstruction_engine/target/debug/deps/libreconstruction_engine-e0d1765e110eb1e5.rlib
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diff --git a/backend/rust/reconstruction_engine/target/debug/deps/reconstruction_engine-da6ae83cfbdab3ea b/backend/rust/reconstruction_engine/target/debug/deps/reconstruction_engine-da6ae83cfbdab3ea
new file mode 100755
index 0000000..77eeb6d
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diff --git a/backend/rust/reconstruction_engine/target/debug/deps/reconstruction_engine-da6ae83cfbdab3ea.d b/backend/rust/reconstruction_engine/target/debug/deps/reconstruction_engine-da6ae83cfbdab3ea.d
new file mode 100644
index 0000000..15c2d6b
--- /dev/null
+++ b/backend/rust/reconstruction_engine/target/debug/deps/reconstruction_engine-da6ae83cfbdab3ea.d
@@ -0,0 +1,5 @@
+/app/backend/rust/reconstruction_engine/target/debug/deps/reconstruction_engine-da6ae83cfbdab3ea: src/lib.rs
+
+/app/backend/rust/reconstruction_engine/target/debug/deps/reconstruction_engine-da6ae83cfbdab3ea.d: src/lib.rs
+
+src/lib.rs:
diff --git a/backend/rust/reconstruction_engine/target/debug/deps/reconstruction_engine-e0d1765e110eb1e5.d b/backend/rust/reconstruction_engine/target/debug/deps/reconstruction_engine-e0d1765e110eb1e5.d
new file mode 100644
index 0000000..8791301
--- /dev/null
+++ b/backend/rust/reconstruction_engine/target/debug/deps/reconstruction_engine-e0d1765e110eb1e5.d
@@ -0,0 +1,7 @@
+/app/backend/rust/reconstruction_engine/target/debug/deps/libreconstruction_engine-e0d1765e110eb1e5.rmeta: src/lib.rs
+
+/app/backend/rust/reconstruction_engine/target/debug/deps/libreconstruction_engine-e0d1765e110eb1e5.rlib: src/lib.rs
+
+/app/backend/rust/reconstruction_engine/target/debug/deps/reconstruction_engine-e0d1765e110eb1e5.d: src/lib.rs
+
+src/lib.rs:
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diff --git a/frontend/main_ui.py b/frontend/main_ui.py
new file mode 100644
index 0000000..f892b81
--- /dev/null
+++ b/frontend/main_ui.py
@@ -0,0 +1,87 @@
+import sys
+import subprocess
+import os # For path joining
+from PyQt6.QtWidgets import QApplication, QMainWindow, QLabel, QWidget, QVBoxLayout, QPushButton
+from PyQt6.QtCore import Qt
+
+# Adjust Python path to find backend modules
+# This assumes the script is run from the root of the repository or that the structure is in PYTHONPATH
+sys.path.append(os.path.join(os.path.dirname(__file__), '..'))
+from backend.python.acquisition import AcquisitionModule
+
+
+class MainWindow(QMainWindow):
+    def __init__(self):
+        super().__init__()
+        self.setWindowTitle("3D Reconstruction Viewer")
+        self.setGeometry(100, 100, 800, 600)  # x, y, width, height
+
+        # Central widget and layout
+        central_widget = QWidget(self)
+        self.setCentralWidget(central_widget)
+        layout = QVBoxLayout(central_widget)
+
+        # Placeholder for 3D view
+        self.placeholder_label = QLabel("3D View Placeholder", self)
+        self.placeholder_label.setStyleSheet("border: 1px solid black; padding: 10px; font-size: 16px;")
+        self.placeholder_label.setAlignment(Qt.AlignmentFlag.AlignCenter)
+        layout.addWidget(self.placeholder_label)
+
+        # Start Scan button
+        self.start_scan_button = QPushButton("Start Scan", self)
+        self.start_scan_button.clicked.connect(self.on_start_scan_clicked)
+        layout.addWidget(self.start_scan_button)
+
+        central_widget.setLayout(layout)
+
+        # Initialize Acquisition Module
+        self.acquisition_module = AcquisitionModule()
+        # Define path to the mock rust runner - adjust if your structure is different
+        # Assuming 'frontend' and 'backend' are sibling directories
+        self.mock_rust_runner_path = os.path.join(
+            os.path.dirname(__file__), # current dir (frontend)
+            "..",                     # project root
+            "backend", "rust", "mock_rust_runner.py"
+        )
+
+
+    def on_start_scan_clicked(self):
+        self.placeholder_label.setText("Scanning...")
+        QApplication.processEvents() # Update UI
+
+        try:
+            # 1. Get frame paths from acquisition module
+            rgb_filepath, depth_filepath = self.acquisition_module.get_frames()
+            self.placeholder_label.setText(f"Frames saved: {rgb_filepath}, {depth_filepath}\nRunning reconstruction...")
+            QApplication.processEvents()
+
+            # 2. Simulate calling Rust reconstruction engine
+            # In a real scenario, this would be the path to the compiled Rust executable
+            cmd = [sys.executable, self.mock_rust_runner_path, rgb_filepath, depth_filepath]
+
+            # Run the command
+            # We are in frontend/ folder, paths temp_rgb.npy and temp_depth.npy are in current working directory
+            # which is the root of the repo if we run from root.
+            # The acquisition module saves them to CWD.
+            # The mock_rust_runner.py expects them to be accessible.
+            process = subprocess.run(cmd, capture_output=True, text=True, check=True, cwd=".") # Run from repo root
+
+            result_output = process.stdout.strip()
+            self.placeholder_label.setText(result_output)
+
+        except FileNotFoundError:
+            self.placeholder_label.setText(f"Error: Mock runner script not found at {self.mock_rust_runner_path}")
+        except subprocess.CalledProcessError as e:
+            self.placeholder_label.setText(f"Error during reconstruction: {e.stderr}")
+        except Exception as e:
+            self.placeholder_label.setText(f"An unexpected error occurred: {str(e)}")
+
+
+def main():
+    app = QApplication(sys.argv)
+    window = MainWindow()
+    window.show()
+    sys.exit(app.exec())
+
+if __name__ == '__main__':
+    main()
diff --git a/frontend/requirements.txt b/frontend/requirements.txt
new file mode 100644
index 0000000..ee397a4
--- /dev/null
+++ b/frontend/requirements.txt
@@ -0,0 +1 @@
+PyQt6