created android ci workflow

.github/workflows/android.yml

@@ -0,0 +1,35 @@
+name: OpenLetters-Android
+
+on:
+  push:
+    branches:
+      - '*'
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v3
+
+      - name: Set up JDK 11
+        uses: actions/setup-java@v3
+        with:
+          java-version: '11'
+          distribution: 'temurin'
+
+      - name: Run ktlintCheck
+        uses: gradle/gradle-build-action@v2
+        with:
+          arguments: ktlintCheck
+
+      - name: Run unit tests
+        uses: gradle/gradle-build-action@v2
+        with:
+          arguments: test
+
+      - name: Build debug APK
+        uses: gradle/gradle-build-action@v2
+        with:
+          arguments: assembleDebug