Merge "Add README." into main am: 06cc64d820 am: bb57f623c2

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

Change-Id: I88d332bc1dc894c331050fb5677a727c8b1b4113
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>