- Use AOSP links
- Add git workflow & instructions in readme.md
- Add build.gradle for RotaryPlayground
- Fix build errors in TestMediaApp
- Add git_clone_projects.sh & go_rotary.sh

Bug: 161492279
Test: Build and Run both sucessfully on Android Studio and Emulator
Change-Id: Ia73641f770044518a87f7487f52c734ec46f1a2b