add android sdk ndk
add platform, system image, add on, sample
Merge branch 'feature/0.0.1' into develop

* feature/0.0.1:
  add platform, system image, add on, sample
  add android sdk ndk
Merge branch 'release/0.0.1'

* release/0.0.1:
  add platform, system image, add on, sample
  add android sdk ndk