Add release notes for 3.0.0 (#506)

Signed-off-by: Jiaping Zeng <[email protected]>

Author: jiapingzeng

release-notes/opensearch-dashboards-search-relevance.release-notes-3.0.0.0.md

@@ -0,0 +1,11 @@
+## Version 3.0.0.0 Release Notes
+
+Compatible with OpenSearch 3.0.0.0
+
+### Features
+* Add cross cluster support ([#497](https://github.com/opensearch-project/dashboards-search-relevance/pull/497))
+
+### Maintenance
+* Increment version to 3.0.0.0 ([#505](https://github.com/opensearch-project/dashboards-search-relevance/pull/505))
+* Increment version to 3.0.0.0-beta1 ([#491](https://github.com/opensearch-project/dashboards-search-relevance/pull/491))
+* Increment version to 3.0.0.0-alpha1 ([#486](https://github.com/opensearch-project/dashboards-search-relevance/pull/486))