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>
tree: 06ce8dd33dd6174f3af30a7d85c02ead3528ce7b
  1. res/
  2. src/
  3. Android.bp
  4. AndroidManifest.xml
  5. OWNERS
  6. PREUPLOAD.cfg
  7. README