Add 1.3 release notes (#175) (#185)

* Create opensearch-alerting-dashboards-plugin.release-notes-1.3.0.0.md

Signed-off-by: Annie Lee <leeyun@amazon.com>

* Update opensearch-alerting-dashboards-plugin.release-notes-1.3.0.0.md

Signed-off-by: Annie Lee <leeyun@amazon.com>
(cherry picked from commit 98f7904)

Co-authored-by: Annie Lee <leeyun@amazon.com>

release-notes/opensearch-alerting-dashboards-plugin.release-notes-1.3.0.0.md

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+## Version 1.3.0.0 2022-02-17
+Compatible with OpenSearch Dashboards 1.3.0
+
+### Enhancements 
+* Implemented a toast to display successful attempts to acknowledge alerts. Refactored alerts dashboard flyout to refresh its alerts table when alerts are acknowledged. ([#160](https://github.com/opensearch-project/alerting-dashboards-plugin/pull/160))
+* Refactored acknowledge alerts button on Alerts by trigger dashboard page to be a modal experience. ([#167](https://github.com/opensearch-project/alerting-dashboards-plugin/pull/167))
+
+### Maintenance
+* Bumping version to 1.3. ([#159](https://github.com/opensearch-project/alerting-dashboards-plugin/pull/159))
+* adding CODEOWNERS file ([#150](https://github.com/opensearch-project/alerting-dashboards-plugin/pull/150))
+* Configure WhiteSource for github.com ([#153](https://github.com/opensearch-project/alerting-dashboards-plugin/pull/153))
+* Adding basic unit tests ([#151](https://github.com/opensearch-project/alerting-dashboards-plugin/pull/151))
+* Updated copyright notices and headers. ([#168](https://github.com/opensearch-project/alerting-dashboards-plugin/pull/168))  
+* Adding a few more basic unit tests ([#180](https://github.com/opensearch-project/alerting-dashboards-plugin/pull/180))
+* Add backport workflow ([#176](https://github.com/opensearch-project/alerting-dashboards-plugin/pull/176))
+
+### Bug Fixes
+* Fix error handling when config index is not found ([#173](https://github.com/opensearch-project/alerting-dashboards-plugin/pull/173))
+* Update getDestination response  ([#182](https://github.com/opensearch-project/alerting-dashboards-plugin/pull/182))
+
+### Infrastructure
+* Remove node version declaration in package.json ([#166](https://github.com/opensearch-project/alerting-dashboards-plugin/pull/166))
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