libsepol: Add a README.android file.

Add a README.android file to libsepol identifying its upstream
origin, current version, and new files added.

Change-Id: I3b191f75ce9c71b1ae642c8788f61e9c98d933e7
Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>
1 file changed