Merge pull request #656 from rupal-bq/release-notes-2.6.0

Add release notes for 2.6.0

Author: mengweieric

release-notes/opensearch-reporting.release-notes-2.6.0.0.md

@@ -0,0 +1,5 @@
+## Version 2.6.0.0 Release Notes
+Compatible with OpenSearch and OpenSearch Dashboards Version 2.6.0
+
+### Infrastructure
+* Remove unnecessary scripts after repo split  [#622](https://github.com/opensearch-project/reporting/pull/622))