adding 2.15 release notes (#781)

Signed-off-by: Amit Galitzky <amgalitz@amazon.com>
(cherry picked from commit 17003ad)

Author: amitgalitz

release-notes/opensearch-anomaly-detection-dashboards.release-notes-2.15.0.0.md

@@ -0,0 +1,19 @@
+## Version 2.15.0.0 Release Notes
+
+Compatible with OpenSearch Dashboards 2.15.0
+
+### Features
+* support MDS in feature anywhere ([#767](https://github.com/opensearch-project/anomaly-detection-dashboards-plugin/pull/767))
+* update create detector page and detector detail page to add custom result index lifecycle management settings ([#770](https://github.com/opensearch-project/anomaly-detection-dashboards-plugin/pull/770))
+
+### Enhancements
+* Update Frontend for Custom Result Index Query and Fix Issues ([#772](https://github.com/opensearch-project/anomaly-detection-dashboards-plugin/pull/772))
+
+### Bug Fixes
+
+* Fix handling of special characters in categorical values ([#757](https://github.com/opensearch-project/anomaly-detection-dashboards-plugin/pull/757))
+* Fix Warning Message About Custom Result Index Despite Existing Indices ([#759](https://github.com/opensearch-project/anomaly-detection-dashboards-plugin/pull/759))
+
+### Maintenance
+
+* Update 2.x to 2.15.0 ([#769](https://github.com/opensearch-project/anomaly-detection-dashboards-plugin/pull/769))