Add Bitbucket Pipelines to readme

Author: martinlowinski

README.md

@@ -1,3 +1,26 @@
 # Docker image with Android SDK and Flutter
 
 [![](https://images.microbadger.com/badges/version/martinlowinski/flutter-android-sdk.svg)](https://microbadger.com/images/martinlowinski/flutter-android-sdk "Get your own version badge on microbadger.com") [![](https://images.microbadger.com/badges/image/martinlowinski/flutter-android-sdk.svg)](https://microbadger.com/images/martinlowinski/flutter-android-sdk "Get your own image badge on microbadger.com")
+
+## Bitbucket Pipelines
+
+This image can be used to test and build Android APKs developed with Flutter. Here is an example `bitbucket-pipelines.yml` for Bitbucket Pipelines including caches for gradle and gradlewrapper:
+
+```
+image: martinlowinski/flutter-android-sdk
+
+pipelines:
+ default:
+ - step:
+ caches:
+ - gradle
+ - gradlewrapper
+ script:
+ - echo "Building APK..."
+ - flutter doctor
+ - flutter -v build apk
+
+definitions:
+ caches:
+ gradlewrapper: ~/.gradle/wrapper
+```