Added workflow for GitHub actions.

.github/workflows/build_debug_workflow.yaml

@@ -0,0 +1,28 @@
+name: Android Build Release Workflow
+
+on:
+  push:
+    branches: [ main ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+      - name: set up JDK 11
+        uses: actions/setup-java@v1
+        with:
+          java-version: 11
+
+      - name: Build Project
+        run: ./gradlew assemble
+
+      - name: Build Debug APK
+        run: bash ./gradlew :app:assembleDebug
+
+      - name: Upload APK
+        uses: actions/upload-artifact@v2
+        with:
+          name: App
+          path: ${{ github.workspace}} /app/build/outputs/apk/debug/app-debug.apk