Add release note for 3.1.0

Signed-off-by: Junwei Dai <junweid@amazon.com>
(cherry picked from commit a99b814)

Author: Junwei Dai

CHANGELOG.md

@@ -6,17 +6,8 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.1.0/)
 ## [Unreleased 3.1](https://github.com/opensearch-project/flow-framework/compare/3.0...HEAD)
 ### Features
 ### Enhancements
-- Make thread pool sizes configurable ([#1139](https://github.com/opensearch-project/flow-framework/issues/1139))
-
 ### Bug Fixes
-- Fixing llm field processing in RegisterAgentStep ([#1151](https://github.com/opensearch-project/flow-framework/pull/1151))
-- Include exception type in WorkflowState error field even if no cause ([#1154](https://github.com/opensearch-project/flow-framework/pull/1154))
-- Pass llm spec params to builder ([#1155](https://github.com/opensearch-project/flow-framework/pull/1155))
-
 ### Infrastructure
-- Conditionally include ddb-client dependency only if env variable set ([#1141](https://github.com/opensearch-project/flow-framework/issues/1141))
-
 ### Documentation
-- Feat: add data summary with log pattern agent template ([#1137](https://github.com/opensearch-project/flow-framework/pull/1137))
 ### Maintenance
 ### Refactoring

release-notes/opensearch-flow-framework.release-notes-3.1.0.md

@@ -0,0 +1,17 @@
+## Version 3.1.0 Release Notes
+
+Compatible with OpenSearch 3.1.0
+
+### Enhancements
+- Make thread pool sizes configurable ([#1139](https://github.com/opensearch-project/flow-framework/issues/1139))
+
+### Bug Fixes
+- Fixing llm field processing in RegisterAgentStep ([#1151](https://github.com/opensearch-project/flow-framework/pull/1151))
+- Include exception type in WorkflowState error field even if no cause ([#1154](https://github.com/opensearch-project/flow-framework/pull/1154))
+- Pass llm spec params to builder ([#1155](https://github.com/opensearch-project/flow-framework/pull/1155))
+
+### Infrastructure
+- Conditionally include ddb-client dependency only if env variable set ([#1141](https://github.com/opensearch-project/flow-framework/issues/1141))
+
+### Documentation
+- Feat: add data summary with log pattern agent template ([#1137](https://github.com/opensearch-project/flow-framework/pull/1137))