Add BUILD.md

BUILD.md

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+# Build Instructions
+
+This document provides the instructions to build the project from source.
+
+## Prerequisites
+
+-   Node.js (v16 or higher)
+-   yarn
+
+## Building the project
+
+1. **Install dependencies:**
+
+    ```bash
+    yarn install
+    ```
+
+2. **Run the build script:**
+   The following command will compile the TypeScript code from the `lib` directory and output the result in the `dist` directory.
+    ```bash
+    yarn tsc --target es5 --lib es2021,DOM --moduleResolution node --strict --esModuleInterop --declaration --jsx react --skipLibCheck --outDir dist --rootDir lib lib/*.ts lib/**/*.ts lib/**/*.tsx && cp package.json README.md dist/ && find lib/ -type f -name '*.css' -exec sh -c 'cp {} $(echo {} | sed s/^lib/dist/)' \\;
+    ```
+    This command does the following:
+
+-   Compiles TypeScript files to JavaScript.
+-   Copies `package.json` and `README.md` to the `dist` folder.
+-   Copies any `.css` files to the `dist` folder, preserving the directory structure.