Add metrics API

Defines MetricsData, MetricsReport and MetricsManager classes
so client xApps can generate and send reports via RMR.

Issue-ID: RIC-381
Signed-off-by: Lott, Christopher (cl778h) <cl778h@att.com>
Change-Id: I46890db2e9fedd007412cb480f592d059687ccf8
diff --git a/docs/release-notes.rst b/docs/release-notes.rst
index c122621..1b82c2d 100644
--- a/docs/release-notes.rst
+++ b/docs/release-notes.rst
@@ -11,10 +11,16 @@
 and this project adheres to `Semantic Versioning <http://semver.org/>`__.
 
 
+[1.5.0] - 2020-07-10
+--------------------
+* Add Metrics API (`RIC-381 <https://jira.o-ran-sc.org/browse/RIC-381>`_)
+
+
 [1.4.0] - 2020-07-06
 --------------------
 * Revise Alarm manager to send via RMR wormhole (`RIC-529 <https://jira.o-ran-sc.org/browse/RIC-529>`_)
 
+
 [1.3.0] - 2020-06-24
 --------------------
 * Add configuration-change API (`RIC-425 <https://jira.o-ran-sc.org/browse/RIC-425>`_)