Add simple CI

.github/workflows/android.yml

@@ -0,0 +1,39 @@
+name: Android CI
+
+on:
+  push:
+    branches: [ "master", "develop" ]
+  pull_request:
+    branches: [ "master", "develop" ]
+  workflow_dispatch:
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout repository with submodules
+      uses: actions/checkout@v4
+      with:
+        submodules: recursive
+        fetch-depth: 0
+        token: ${{ secrets.GITHUB_TOKEN }}
+
+    - name: set up JDK 21
+      uses: actions/setup-java@v4
+      with:
+        java-version: '21'
+        distribution: 'temurin'
+        cache: gradle
+
+    - name: Make all scripts executable
+      run: |
+        chmod +x gradlew
+        chmod +x presentation/src/main/cpp/build.sh
+
+    - name: Build Debug APK (without GMS)
+      run: ./gradlew assembleDebug
+
+    - name: Run Unit Tests
+      run: ./gradlew testDebugUnitTest