Merge "Add README with details about the status of support for this app" into main am: 6bf884ef51

Original change: https://android-review.googlesource.com/c/platform/packages/apps/Gallery2/+/3320633

Change-Id: I366a58ad1961fa226096834f11c97c64f8aa46f7
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>