Add README with details about the status of support for this app am: e2b77d6c26 am: 3cf5e0fc65 Original change: https://android-review.googlesource.com/c/platform/packages/apps/Car/MessengerPrebuilt/+/3320793 Change-Id: Ib7b97ee373d13b33aea474935733fbb895bcc2b1 Signed-off-by: Automerger Merge Worker <[email protected]>