Add README with details about the status of support for this app am: 2d953d6dc6

Original change: https://android-review.googlesource.com/c/platform/packages/apps/Car/SystemUpdater/+/3319396

Change-Id: I8e8a4cb483f243a47bb40104c087b34382a806af
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>
tree: 248d08d20051be7e35f725bcf2ff0e130184c267
  1. res/
  2. src/
  3. Android.bp
  4. AndroidManifest.xml
  5. OWNERS
  6. PREUPLOAD.cfg
  7. README