add README

N/A

Change-Id: I740b8b4ad272e24b7d556964134351e1e4246d6a
Signed-off-by: mochangming <mochangming@xiaomi.com>
make keyguard related code being independent of framework/base

Change-Id: I9f037710ecda43ad2ab0928d09c71b3cf6514f1c
amend miui hook

Change-Id: I9b5196fc04111203adbb96e8fffea24e92b86847