Add v2.16.0 release notes (#390)

Signed-off-by: Rupal Mahajan <maharup@amazon.com>
(cherry picked from commit af864d3)
Signed-off-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

release-notes/opensearch-dashboards-reporting.release-notes-2.16.0.0.md

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+## Version 2.16.0.0 Release Notes
+
+Compatible with OpenSearch and OpenSearch Dashboards Version 2.16.0
+
+### Enhancements
+* [Navigation] Register all plugins to NavGroups ([#369](https://github.com/opensearch-project/dashboards-reporting/pull/369))
+* [Look&Feel] Adjust header and text sizes in reporting menu options ([#379](https://github.com/opensearch-project/dashboards-reporting/pull/379))
+
+### Bug Fixes
+* Update dependency jsdom to v18 ([#381](https://github.com/opensearch-project/dashboards-reporting/pull/381))
+* Update dependency ws to v7.5.10 ([#385](https://github.com/opensearch-project/dashboards-reporting/pull/385))
+* Add braces v3.0.3 to resolution ([#388](https://github.com/opensearch-project/dashboards-reporting/pull/388))
+
+### Maintenance
+* Increment version to 2.16.0.0 ([#366](https://github.com/opensearch-project/dashboards-reporting/pull/366))