Add 2.15 release notes (#672)

Signed-off-by: Chase Engelbrecht <engechas@amazon.com>
(cherry picked from commit 5c4e828)
Signed-off-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

release-notes/opensearch-common-utils.release-notes-2.15.0.0.md

@@ -0,0 +1,12 @@
+## Version 2.15.0.0 2024-06-10
+
+Compatible with OpenSearch 2.15.0
+
+### Maintenance
+* Increment version to 2.15.0-SNAPSHOT ([#651](https://github.com/opensearch-project/common-utils/pull/651))
+
+### Enhancements
+* Add start_time and end_time filters to GetAlertsRequest. ([#655](https://github.com/opensearch-project/common-utils/pull/655))
+
+### Documentation
+* Added 2.15.0.0 release notes. ([#672](https://github.com/opensearch-project/common-utils/pull/672))