Add v2.13.0 Release Notes (#1142)

* Add v2.13.0 Release Notes

Signed-off-by: Nishant Goel <nisgoel@amazon.com>

* Correcting the filename and removing one extra line

Signed-off-by: Nishant Goel <nisgoel@amazon.com>

* Adding documentation notes in release notes

Signed-off-by: Nishant Goel <nisgoel@amazon.com>

---------

Signed-off-by: Nishant Goel <nisgoel@amazon.com>

release-notes/opensearch-index-management.release-notes-2.13.0.0.md

@@ -0,0 +1,17 @@
+## Version 2.13.0.0 2024-03-20
+
+Compatible with OpenSearch 2.13.0
+
+### Maintenance
+
+* Increment version to 2.13.0-SNAPSHOT. ([#1096](https://github.com/opensearch-project/index-management/pull/1096))
+* Upgrade com.github.seancfoley:ipaddress to mitigate CVE-2023-50570  ([#1126](https://github.com/opensearch-project/index-management/pull/1126))
+* Updates demo certs and admin keystore ([#1116](https://github.com/opensearch-project/index-management/pull/1116))
+
+### Bug fixes
+
+* Fix Typo in Alias Message ([#1137](https://github.com/opensearch-project/index-management/pull/1137))
+
+### Documentation
+
+* Version 2.13 Release Notes Draft ([#1142](https://github.com/opensearch-project/index-management/pull/1142))