TBR: Fix and remove TODOs from README.
TBR: Fix and remove TODOs from README.

Change-Id: Iab4608b455750b21e6e953a8bb071823479c9a98

viksit/chat,viksit/chat,vanadium/chat,viksit/chat,vanadium/chat,viksit/chat,viksit/chat,vanadium/chat,vanadium/chat,vanadium/chat