Add initial project structure and documentation

- Created architecture documentation outlining high-level design, module organization, data flow, security model, performance considerations, testing strategy, and deployment architecture.
- Added pyproject.toml for project metadata and dependencies management.
- Introduced requirements files for development and production dependencies.
- Set up testing configuration with pytest and tox.
- Established basic directory structure for source code and tests, including __init__.py files.
- Implemented a sample web application (index.html) for drag-and-drop functionality.
- Configured VS Code workspace settings for Python development.

.github/workflows/tests.yml

@@ -0,0 +1,101 @@
+name: Tests & Quality Checks
+
+on:
+  push:
+    branches: [ main, develop ]
+  pull_request:
+    branches: [ main, develop ]
+
+jobs:
+  test:
+    name: Test on Python ${{ matrix.python-version }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, windows-latest, macos-latest]
+        python-version: ["3.10", "3.11", "3.12"]
+        exclude:
+          # Reduce matrix to save CI time
+          - os: ubuntu-latest
+            python-version: "3.10"
+          - os: macos-latest
+            python-version: "3.10"
+
+    steps:
+    - uses: actions/checkout@v4
+    
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v4
+      with:
+        python-version: ${{ matrix.python-version }}
+    
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install -r requirements-dev.txt
+    
+    - name: Lint with ruff
+      run: ruff check src tests
+      continue-on-error: true
+    
+    - name: Format check with black
+      run: black --check src tests
+      continue-on-error: true
+    
+    - name: Type check with mypy
+      run: mypy src/webdrop_bridge
+      continue-on-error: true
+    
+    - name: Run pytest
+      run: pytest --cov=src/webdrop_bridge --cov-report=xml
+    
+    - name: Upload coverage to Codecov
+      uses: codecov/codecov-action@v3
+      with:
+        file: ./coverage.xml
+        flags: unittests
+        name: codecov-umbrella
+
+  build:
+    name: Build Artifacts
+    runs-on: ${{ matrix.os }}
+    needs: test
+    if: success()
+    strategy:
+      matrix:
+        include:
+          - os: windows-latest
+            artifact: webdrop-bridge-windows
+          - os: macos-latest
+            artifact: webdrop-bridge-macos
+
+    steps:
+    - uses: actions/checkout@v4
+    
+    - name: Set up Python
+      uses: actions/setup-python@v4
+      with:
+        python-version: "3.11"
+    
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install -r requirements-dev.txt
+    
+    - name: Build Windows MSI
+      if: matrix.os == 'windows-latest'
+      run: python build/scripts/build_windows.py
+      continue-on-error: true
+    
+    - name: Build macOS DMG
+      if: matrix.os == 'macos-latest'
+      run: bash build/scripts/build_macos.sh
+      continue-on-error: true
+    
+    - name: Upload artifacts
+      uses: actions/upload-artifact@v3
+      with:
+        name: ${{ matrix.artifact }}
+        path: build/dist/
+        retention-days: 30