Add README with details about the status of support for this app am: 2d953d6dc6 am: d574c9bc58 Original change: https://android-review.googlesource.com/c/platform/packages/apps/Car/SystemUpdater/+/3319396 Change-Id: I97ac5bcef499be2382f0f5a907bc1e4ccf352aae Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>