Add minimal Gradle setup

.gitignore

@@ -1,3 +1,10 @@
 /bin/
+/build/
 /charImg/
+.gradle/
+
 .DS_Store
+
+# IDEs
+.idea/
+.vscode/

build.gradle.kts

@@ -0,0 +1,47 @@
+// Tell gradle that this is in fact a java project
+plugins {
+    java
+}
+
+// Add maven central as the repository to resolve dependencies
+repositories {
+    mavenCentral()
+}
+
+// Set java version to Java 21
+java {
+    toolchain {
+        languageVersion.set(JavaLanguageVersion.of(21))
+    }
+}
+
+dependencies {
+    testImplementation(platform("org.junit:junit-bom:5.13.2")) // Make sure junit versions are compatible
+    testImplementation("org.junit.jupiter:junit-jupiter") // JUnit 5 api
+    testImplementation("org.assertj:assertj-core:3.27.3") // AssertJ for fluent assertions
+
+    testRuntimeOnly("org.junit.platform:junit-platform-launcher") // JUnit 5 runtime support
+}
+
+// Add 'src/' as a source directory
+// TODO: Sources should be move to src/main/java
+sourceSets.main {
+    java {
+        srcDirs("src")
+    }
+    resources {
+        srcDirs("resources")
+    }
+}
+
+// Add 'test/' as a test source directory
+// TODO: Tests should be moved to src/test/java
+sourceSets.test {
+    java {
+        srcDirs("test")
+    }
+}
+
+tasks.test {
+    useJUnitPlatform() // Use JUnit 5 for testing
+}

gradle.properties

@@ -0,0 +1,3 @@
+# Speedup build by enabling caching
+org.gradle.caching=true
+org.gradle.configuration-cache=true

gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,7 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-9.2.1-bin.zip
+networkTimeout=10000
+validateDistributionUrl=true
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists