Revert "Delete proguard-project.txt"

This reverts commit d73f2bdd669aff795199e66e79cdb0181f928935.
Revert "Delete R.java"

This reverts commit e2af9c3c6c34f0551eea11195044a8219af80f0d.
Revert "Delete BuildConfig.java"

This reverts commit 84b2b5da6d5fdcdf5628b12c71640eb49113322f.
Revert "Removing ignored file project.properties."

This reverts commit 904167de74ca0a221ca3928427dbb2c66225f8ce.