add o2 release notes

Signed-off-by: weichen <niweichen@chinamobile.com>
Change-Id: I3430f780cba6353e97834210cdb156b3892a2682
diff --git a/docs/release-notes.rst b/docs/release-notes.rst
index 215eedf..f57a8d0 100644
--- a/docs/release-notes.rst
+++ b/docs/release-notes.rst
@@ -35,7 +35,9 @@
 | 2021-12-15         | E 	          | CMCC               | E Release          |
 |                    |                    |                    |                    |
 +--------------------+--------------------+--------------------+--------------------+
-
+| 2022-7-06          | F	          | CMCC               | F Release          |
+|                    |                    |                    |                    |
++--------------------+--------------------+--------------------+--------------------+
 
 Release Summary
 ---------------
@@ -278,6 +280,9 @@
 
 * :doc:`SMO-VES Release-notes <smo-ves:release-notes>`
 
+SMO-O2 repository is for the implementation, installation, and use of the O2 interface of SMO. It uses the OpenStack Tacker to implement the O2 interface.
+
+* :doc:`SMO-O2 Release-notes <smo-o2:release-notes>`
 
 
 .. Simulations(SIM) Amber release features contain: