add READ_EXTERNAL_STORAGE perm

Change-Id: I74ab284ad6b89d730da2cceca2775fcc37f3cb11
update gradle config

Change-Id: I4d0477c83da14c59d0cca6b86fcb02a32b8ae1bd
add debug variant

Change-Id: I5670a59b3ff17ed5c64f71a84d4e4b171a0ca583