Add 2.10.0 release notes (#707)

Signed-off-by: Ashish Agrawal <[email protected]>
(cherry picked from commit 30b3b71)
Signed-off-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

Author: github-actions[bot]

release-notes/opensearch-alerting-dashboards-plugin.release-notes-2.10.0.0.md

@@ -0,0 +1,13 @@
+## Version 2.10.0.0 2023-09-06
+Compatible with OpenSearch Dashboards 2.10.0
+
+### Maintenance
+* Incremented version to 2.10 ([#703](https://github.com/opensearch-project/alerting-dashboards-plugin/pull/703))
+* bump @cypress/request to 3.0.0 due to CVE-2023-28155 ([#704](https://github.com/opensearch-project/alerting-dashboards-plugin/pull/704))
+
+### Features
+* Updates for dark mode theme ([#695](https://github.com/opensearch-project/alerting-dashboards-plugin/pull/695))
+* Add default Notification subject  ([#701](https://github.com/opensearch-project/alerting-dashboards-plugin/pull/701))
+
+### Documentation
+* Add 2.10.0 release notes ([#707](https://github.com/opensearch-project/alerting-dashboards-plugin/pull/707))