[skip ci] Add Crowdin action (#1091)

.github/workflows/crowdin.yml

@@ -0,0 +1,26 @@
+name: Crowdin Action
+
+on:
+  workflow_dispatch:
+  push:
+    branches: [ master ]
+    paths:
+      - app/src/main/res/values/strings.xml
+
+jobs:
+  synchronize-with-crowdin:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v2
+
+    - name: crowdin action
+      uses: crowdin/github-action@1.0.4
+      with:
+        upload_translations: false
+        download_translations: false
+        upload_sources: true
+        config: 'crowdin.yml'
+      env:
+        CROWDIN_PROJECT_ID: ${{ secrets.CROWDIN_PROJECT_ID }}
+        CROWDIN_API_TOKEN: ${{ secrets.CROWDIN_API_TOKEN }}