Create android.yml

+name: Android CI
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: checkout client-sdk-android
+      uses: actions/checkout@v2.3.4
+    - name: checkout protocol
+      uses: actions/checkout@v2.3.4
+	  with:
+        repository: livekit/protocol
+    - name: set up JDK 12
+      uses: actions/setup-java@v2
+      with:
+        java-version: '12'
+        distribution: 'adopt'
+
+    - name: Grant execute permission for gradlew
+      run: chmod +x gradlew
+    - name: Build with Gradle
+      run: ./gradlew assemble