This patch implements basic user messages with the following APIs.
GET /messages
GET /messages/<message_id>
DELETE /messages/<message_id>
Implements : blueprint summarymessage
Co-Authored-By: Alex Meade <mr.alex.meade@gmail.com>
Co-Authored-By: Sheel Rana <ranasheel2000@gmail.com>
Change-Id: Id8a4a700c1159be24b15056f401a2ea77804d0a0