Add release notes for 3.1 (#749)

Signed-off-by: Tyler Ohlsen <[email protected]>

Author: ohltyler

release-notes/opensearch-flow-framework-dashboards.release-notes-3.1.0.0.md

@@ -0,0 +1,19 @@
+## Version 3.1.0.0 Release Notes
+
+Compatible with OpenSearch 3.1.0.0
+
+### Features
+- Integrate preview panel into inspector panel ([#722](https://github.com/opensearch-project/dashboards-flow-framework/pull/722))
+- Refactor form navigation to left panel ([#737](https://github.com/opensearch-project/dashboards-flow-framework/pull/737))
+- Added workflow template for Semantic Search using Sparse Encoders ([#742](https://github.com/opensearch-project/dashboards-flow-framework/pull/742))
+
+### Enhancements
+- Misc improvements IV ([#743](https://github.com/opensearch-project/dashboards-flow-framework/pull/743))
+- Update README.md ([#744](https://github.com/opensearch-project/dashboards-flow-framework/pull/744))
+
+### Bug Fixes
+
+### Maintenance
+- Remove legacy tutorial doc ([#747](https://github.com/opensearch-project/dashboards-flow-framework/pull/747))
+
+### Refactoring