Add recipe for Bitrise CI

Add a minimal recipe of how to build an Android app (target 28) on Bitrise CI, similar to [.gitlab-ci.yml](https://github.com/mreichelt/docker-android/blob/master/recipes/gitlab-ci/.gitlab-ci.yml), and add it to the [recipes](https://github.com/mreichelt/docker-android/tree/master/recipes) folder.