add release notes for 3.1

Signed-off-by: KashKondaka <37753523+KashKondaka@users.noreply.github.com>

Author: KashKondaka

release-notes/opensearch-common-utils.release-notes-3.1.0.0.md

@@ -0,0 +1,13 @@
+## Version 3.1.0.0 2025-06-17
+
+Compatible with OpenSearch 3.1.0
+
+### Features
+* Updating PublishFindingsRequest to use a list of findings ([#832](https://github.com/opensearch-project/common-utils/pull/832))
+
+### Maintenance
+* Update common-utils shadow plugin repo and bump to 3.0.0.0-alpha1 ([#775](https://github.com/opensearch-project/common-utils/pull/775))
+
+### Bug fixes
+* Validate that index patterns are not allowed in create/update doc level monitor ([#829](https://github.com/opensearch-project/common-utils/pull/829))
+* Fix is doc level monitor check ([#835](https://github.com/opensearch-project/common-utils/pull/835))