Mobile CI/CD demo using App Center and Xamarin.Forms

Commits (steps to reproduce):

  1. Init repository
  2. Add Xamarin.Forms project
  3. Add Unit tests
  4. Add UI tests
  5. Add scripts appcenter-post-clone.sh, appcenter-pre-build.sh, appcenter-post-build.sh
  6. Add In-app upgrade
  7. Add Crash reporting
  8. Add Error reporting
  9. Add Events tracking