doc(release): draft for release notes

Signed-off-by: Raphael Defosseux <raphael.defosseux@eurecom.fr>

CHANGELOG.md

 # RELEASE NOTES: #
 
-## vX.X.X -- YYY 2021 ##
+## v1.2.0 -- September 2021 ##
 
-* Initial release
+* Initial Public Release
+* Full support for Ubuntu18 and RHEL7
+* CI Build support
+
+## v1.0.0 -- January 2021 ##
+
+* Initial Private Release