Add release notes for 2.6.0.0 (opensearch-project#1343)

Signed-off-by: Craig Perkins <[email protected]>

release-notes/opensearch-security-dashboards-plugin.release-notes-2.6.0.0.md

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+## 2023-02-28 Version 2.6.0.0
+
+Compatible with Opensearch-Dashboards 2.6.0
+
+### Enhancements
+* Windows CI Support ([#1320](https://github.com/opensearch-project/security-dashboards-plugin/pull/1320))
+* Add indices:admin/close* to list of permissible index permissions ([#1323](https://github.com/opensearch-project/security-dashboards-plugin/pull/1323))
+* Synchronize all permissions from latest OpenSearch ([#1333](https://github.com/opensearch-project/security-dashboards-plugin/pull/1333))
+
+### Bug Fixes
+* Fix issue with jwt as url param after getAdditionalAuthHeader switched to async ([#1292](https://github.com/opensearch-project/security-dashboards-plugin/pull/1292))
+* Update URLs referencing old docs-beta site ([#1231](https://github.com/opensearch-project/security-dashboards-plugin/pull/1231))
+* Fix plugin configuration path ([#1304](https://github.com/opensearch-project/security-dashboards-plugin/pull/1304))
+
+### Maintenance
+* Switch to maven to download plugin ([#1331](https://github.com/opensearch-project/security-dashboards-plugin/pull/1331))