Add git action for app build

Author: cp-radhika-s

.github/workflows/app-build.yml

@@ -0,0 +1,16 @@
+name: Android Build
+
+on: [ push ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: set up JDK 11
+        uses: actions/setup-java@v2
+        with:
+          distribution: adopt
+          java-version: 11
+      - name: Build with Gradle
+        run: ./gradlew build

.gitignore

@@ -1,5 +1,6 @@
 *.iml
 .gradle
+.idea
 /local.properties
 /.idea/caches
 /.idea/libraries