Enable basic GitHub Actions CI

.github/workflows/ci.yml

@@ -0,0 +1,10 @@
+name: ci
+on: [push, pull_request]
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v1
+      - run: yarn --no-lockfile
+      - run: yarn lint

README.md

@@ -1,5 +1,7 @@
 ## react-native-video
 
+[![ci][4]][5]
+
 A `<Video>` component for react-native, as seen in
 [react-native-login](https://github.com/brentvatne/react-native-login)!
 
@@ -1482,6 +1484,8 @@ If you encounter an error `Could not find com.android.support:support-annotation
 [1]: https://github.com/brentvatne/react-native-login/blob/56c47a5d1e23781e86e19b27e10427fd6391f666/App/Screens/UserInfoScreen.js#L32-L35
 [2]: https://github.com/react-native-community/react-native-video/tree/master/example
 [3]: https://developer.apple.com/library/ios/qa/qa1668/_index.html
+[4]: https://github.com/react-native-community/react-native-video/workflows/ci/badge.svg
+[5]: https://github.com/react-native-community/react-native-video/actions
 
 ---