Add 2.10.0 release notes (#755)

* Add 2.10.0 release notes

Signed-off-by: Hailong Cui <ihailong@amazon.com>

* update release notes

Signed-off-by: Hailong Cui <ihailong@amazon.com>

* Update opensearch-notifications.release-notes-2.10.0.0.md

Signed-off-by: Hailong Cui <ihailong@amazon.com>

* fix wrong PR number

Signed-off-by: Hailong Cui <ihailong@amazon.com>

---------

Signed-off-by: Hailong Cui <ihailong@amazon.com>
(cherry picked from commit 1f9d183)
Signed-off-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

release-notes/opensearch-notifications.release-notes-2.10.0.0.md

@@ -0,0 +1,22 @@
+## Version 2.10.0.0 2023-09-25
+
+Compatible with OpenSearch 2.10.0
+
+### Features/Enhancements
+* Support SNS FIFO queues([#716](https://github.com/opensearch-project/notifications/pull/716))
+* Supuport Microsoft teams([#676](https://github.com/opensearch-project/notifications/pull/676),[#746](https://github.com/opensearch-project/notifications/pull/746))
+* Support auto upgrade mapping logic([#699](https://github.com/opensearch-project/notifications/pull/699))
+
+### Maintenance
+* [AUTO] Increment version to 2.10.0-SNAPSHOT([#706](https://github.com/opensearch-project/notifications/pull/706))
+
+### Infrastructure
+* Fix core refactor: StreamIO from common to core.common([#707](https://github.com/opensearch-project/notifications/pull/707))
+* Fix core XcontentFactory refactor([#732](https://github.com/opensearch-project/notifications/pull/732))
+* Fix actions components after core([#739](https://github.com/opensearch-project/notifications/pull/739))
+* Add auto release workflow([#731](https://github.com/opensearch-project/notifications/pull/731))
+* Onboarding system and hidden index([#742](https://github.com/opensearch-project/notifications/pull/742))
+* Updates demo certs used in integ tests([#756](https://github.com/opensearch-project/notifications/pull/756))
+
+### Documentation
+* Add 2.10.0 release notes ([#755](https://github.com/opensearch-project/notifications/pull/755))