Merge "Add README." into main am: 06cc64d820

Original change: https://android-review.googlesource.com/c/platform/development/+/2843615

Change-Id: I43cc95d95b3b5cf4bb3ee659540d9e317723292c
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>