Add release notes for v2.7.0 (#800)

Signed-off-by: Sai Kumar <[email protected]>

release-notes/opensearch-cross-cluster-replication.release-notes-2.7.0.0.md

@@ -0,0 +1,14 @@
+## Version 2.7.0.0 Release Notes
+
+Compatible with OpenSearch 2.7.0
+
+### Bug Fixes
+* Modified autofollow stats to rely on single source for failed indices ([#736](https://github.com/opensearch-project/cross-cluster-replication/pull/736))
+* Update UpdateAutoFollowPatternIT "test auto follow stats" to wait for 60 seconds ([#745](https://github.com/opensearch-project/cross-cluster-replication/pull/745))
+* Update imports from common to core package ([#761](https://github.com/opensearch-project/cross-cluster-replication/pull/761))
+* Adding a proxy mode connection setup for CCR ([#795](https://github.com/opensearch-project/cross-cluster-replication/pull/795))
+* Handled exception under multi-field mapping update ([#789](https://github.com/opensearch-project/cross-cluster-replication/pull/789))
+* Handled batch requests for replication metadata update under cluster state ([#778](https://github.com/opensearch-project/cross-cluster-replication/pull/778))
+
+### Infrastructure
+* Added support for running Integtest on Remote clusters ([#733](https://github.com/opensearch-project/cross-cluster-replication/pull/733))