release notes for 2.18 (#410)

Signed-off-by: sumukhswamy <sumukhhs@amazon.com>
(cherry picked from commit 70742b8)
Signed-off-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

release-notes/opensearch-query-workbench.release-notes-2.18.0.0.md

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+## Version 2.18.0.0 Release Notes
+
+Compatible with OpenSearch and OpenSearch Dashboards 2.18.0
+
+### Bug Fixes
+
+- fix workbench routes to support modal mounting ([#401](https://github.com/opensearch-project/dashboards-query-workbench/pull/401))
+- [Bug]added error handling for api calls ([#408](https://github.com/opensearch-project/dashboards-query-workbench/pull/408))
+