Merge "Add README" am: 0a34762447 am: 61fb2fb909 am: 34ffae94a1

Original change: https://android-review.googlesource.com/c/platform/packages/apps/Dialer/+/2613992

Change-Id: I2b71c400d1cd61b69a73cc169b7a19615f819de5
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>