Merge "Add README with details about the status of support for this app" into main am: f9f1692cf0

Original change: https://android-review.googlesource.com/c/platform/packages/apps/Calendar/+/3320094

Change-Id: Ie9b7a7e867bd6baf677c30d401ca03fa363c2615
Signed-off-by: Automerger Merge Worker <[email protected]>