restored android directory

[a-sajjad72]

In this commit the android directory was deleted. so after this commit we can't able to build app for android.

1. I reset the branch to the commit which is right before the commit in which files were deleted.
2. and i also deleted the build caches which is approximately 1 GiB and also we dont need the build caches.

NOTE: After resetting the branch i also added one more commit (which was committed by me after the deletion of files)