release notes v2.18.0 (#398)

* release notes v2.18.0

Signed-off-by: sumukhswamy <sumukhhs@amazon.com>

* release notes v2.18.0

Signed-off-by: sumukhswamy <sumukhhs@amazon.com>

---------

Signed-off-by: sumukhswamy <sumukhhs@amazon.com>
(cherry picked from commit e7ac602)
Signed-off-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

release-notes/opensearch-dashboards-visualizations.release-notes-2.18.0.0.md

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+## Version 2.18.0.0 Release Notes
+
+Compatible with OpenSearch Dashboards 2.18.0.0
+
+### Maintenance
+
+- Increment version to 2.18.0.0 ([#396](https://github.com/opensearch-project/dashboards-visualizations/pull/396))
+- Adding release notes for 2.18.0 ([#398](https://github.com/opensearch-project/dashboards-visualizations/pull/398))