Add Android project structure and GitHub Actions workflow for APK publishing

Co-authored-by: johndoe6345789 <224850594+johndoe6345789@users.noreply.github.com>

.github/workflows/build-apk.yml

@@ -0,0 +1,43 @@
+name: Build and Publish APK
+
+on:
+  push:
+    branches: [ main, master ]
+  pull_request:
+    branches: [ main, master ]
+  workflow_dispatch:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v4
+      
+    - name: Set up JDK 17
+      uses: actions/setup-java@v4
+      with:
+        java-version: '17'
+        distribution: 'temurin'
+        
+    - name: Grant execute permission for gradlew
+      run: chmod +x gradlew
+      
+    - name: Build Debug APK
+      run: ./gradlew assembleDebug
+      
+    - name: Build Release APK
+      run: ./gradlew assembleRelease
+      
+    - name: Upload Debug APK
+      uses: actions/upload-artifact@v4
+      with:
+        name: app-debug
+        path: app/build/outputs/apk/debug/app-debug.apk
+        
+    - name: Upload Release APK
+      uses: actions/upload-artifact@v4
+      with:
+        name: app-release
+        path: app/build/outputs/apk/release/app-release-unsigned.apk