Add release note RST document to \docs folder in CPS repo

Some examples

• https://github.com/onap/sdc/blob/master/docs/release-notes.rst
• https://github.com/onap/policy-parent/blob/master/docs/release-notes.rst

Suggestion: instead of individual Jira ref. just create/re-use an Jira Filter (check with ToineSiebelink if help needed)

No clear template visible (check ONAP guidelines, search confluence) if cant find use common sections from other projects.

A/C

• Document Reviewed and agreed by team