Adding release notes for 3.0-alpha1 (#990)

* Adding release notes for 3.0-alpha1

Signed-off-by: Junwei Dai <[email protected]>

* adding maintenance change release note

Signed-off-by: Junwei Dai <[email protected]>

* change title

Signed-off-by: Junwei Dai <[email protected]>

---------

Signed-off-by: Junwei Dai <[email protected]>
Co-authored-by: Junwei Dai <[email protected]>

Author: junweid62

release-notes/opensearch-anomaly-detection-dashboards.release-notes-3.0.0.0-alpha1.md

@@ -0,0 +1,6 @@
+## Version 3.0.0.0-alpha1 Release Notes
+
+Compatible with OpenSearch Dashboards 3.0.0.0-alpha1
+
+### Maintenance
+- Bump to version 3.0.0.0-alpha1 ([#985](https://github.com/opensearch-project/anomaly-detection-dashboards-plugin/pull/985))