Setup github actions

Initial pipeline to run tests on PRs

Author: RobertLK

.github/workflows/android.yml

@@ -0,0 +1,16 @@
+name: PR test
+
+on: [pull_request]
+
+jobs:
+  unit_test:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v1
+    - name: set up JDK 1.8
+      uses: actions/setup-java@v1
+      with:
+        java-version: 1.8
+    - name: Build with Gradle
+      run: ./gradlew testDebug