update release note

Signed-off-by: Junqiu Lei <[email protected]>

release-notes/opensearch-dashboards-maps.release-notes-2.6.0.0.md

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+## Version 2.6.0.0 Release Notes
+Compatible with OpenSearch and OpenSearch Dashboards Version 2.6.0
+
+### Features
+* Add map as embeddable to dashboard ([#231](https://github.com/opensearch-project/dashboards-maps/pull/231))
+* Add maps saved object for sample datasets ([#240](https://github.com/opensearch-project/dashboards-maps/pull/240))
+
+### Infrastructure
+* [Cypress fix] Wait map saved before open maps listing ([#218](https://github.com/opensearch-project/dashboards-maps/pull/218))
+
+### Refactoring
+* Refactor add layer operations ([#222](https://github.com/opensearch-project/dashboards-maps/pull/222))
+* Refactor layer operations ([#224](https://github.com/opensearch-project/dashboards-maps/pull/224))
+* Refactor layer properties as own interface ([#225](https://github.com/opensearch-project/dashboards-maps/pull/225))
+
+### Enhancements
+* Fix popup display while zoomed out ([#226](https://github.com/opensearch-project/dashboards-maps/pull/226))
+* Limit max number of layers ([#216](https://github.com/opensearch-project/dashboards-maps/pull/216))
+* Add close button to tooltip hover ([#263](https://github.com/opensearch-project/dashboards-maps/pull/263))
+* Add scroll bar when more layers added ([#254](https://github.com/opensearch-project/dashboards-maps/pull/254))
+* Align items in add new layer modal ([#256](https://github.com/opensearch-project/dashboards-maps/pull/256))
+* Add indexPatterns to map embeddable output for dashboard filters ([#272](https://github.com/opensearch-project/dashboards-maps/pull/272))
+
+### Bug Fixes
+* Fix custom layer render opacity config ([#289](https://github.com/opensearch-project/dashboards-maps/pull/289))