checkpolicy:  Add a README.android file.

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

Change-Id: I57474cbfbe100140456a5e6650c9ae1a5dc72a95
Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>
diff --git a/README.android b/README.android
new file mode 100644
index 0000000..7f618cc
--- /dev/null
+++ b/README.android
@@ -0,0 +1,9 @@
+This directory contains checkpolicy, the SELinux policy compiler.
+Upstream git repository is https://github.com/SELinuxProject/selinux
+(libsepol subdirectory) and official releases are available from
+https://github.com/SELinuxProject/selinux/wiki/Releases.
+
+Last updated to checkpolicy 2.4.
+
+New files added for Android:
+* checkpolicy/Android.mk (later added upstream)