Added release notes for v2.18

Signed-off-by: Kshitij Tandon <tandonks@amazon.com>

release-notes/opensearch-index-management-dashboards-plugin.release-notes-2.18.0.0.md

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+## Version 2.18.0.0 2024-10-28
+
+Compatible with OpenSearch 2.18.0
+
+### Enhancements
+
+* Fit and Finish UX changes ([#1179](https://github.com/opensearch-project/index-management-dashboards-plugin/pull/1179))
+* Replaced EuiText with EuiTitle for section headers in content areas ([#1182](https://github.com/opensearch-project/index-management-dashboards-plugin/pull/1182))
+* Setting validation for transform APIs ([#1191](https://github.com/opensearch-project/index-management-dashboards-plugin/pull/1191))
+
+
+### Bug Fixes
+
+* bug-fix: Create snapshot policy button reloads the dashboard ([#1187](https://github.com/opensearch-project/index-management-dashboards-plugin/pull/1187))
+* Fixing a bug with initial data source being set to local cluster ([#1189](https://github.com/opensearch-project/index-management-dashboards-plugin/pull/1189))
+
+
+### Maintenance
+
+* Increment version to 2.18.0.0 ([#1180](https://github.com/opensearch-project/index-management-dashboards-plugin/pull/1180))