Release-Notes.md

-_Release Notes Intro [Placeholder]_
 
-# M6 - July X, 2021
-_Short summary of this release [Placeholder]_
+# Milestone 6 - July 2, 2021
+OSDU R3 Milestone 6 is released on Jul 2, 2021. For detailed services that are included in this release, please refer to M6 tagging notes: 
+* [R3 Milestone 6 deliverables - 0.9.0](https://community.opengroup.org/osdu/governance/project-management-committee/-/wikis/Release-0.9-Tagging-Notes)
 
 ## New Features