Adds 2.0 release notes (#367) (#368)

Signed-off-by: Clay Downs <downsrob@amazon.com>
(cherry picked from commit a0f81d1)

Co-authored-by: Clay Downs <downsrob@amazon.com>

release-notes/opensearch-index-management.release-notes-2.0.0.0.md

@@ -0,0 +1,31 @@
+## Version 2.0.0.0 2022-05-18
+
+Compatible with OpenSearch 2.0.0
+
+### Features
+* Adds shrink action to ISM ([#326](https://github.com/opensearch-project/index-management/pull/326))
+* Notification integration with IM ([#338](https://github.com/opensearch-project/index-management/pull/338))
+
+### Bug Fixes
+* Fix metadata migration logic error when update setting call failed ([#328](https://github.com/opensearch-project/index-management/pull/328))
+* Updates search text field to keyword subfield for policies and managed indices ([#267](https://github.com/opensearch-project/index-management/pull/267))
+* Fixes shard allocation checks ([#335](https://github.com/opensearch-project/index-management/pull/335))
+* BugFix: Notification integration issues ([#339](https://github.com/opensearch-project/index-management/pull/339))
+* Fixes flaky continuous transforms and shrink tests ([#340](https://github.com/opensearch-project/index-management/pull/340))
+* Minor improvements ([#345](https://github.com/opensearch-project/index-management/pull/345))
+* Strengthen scroll search in Coordinator ([#356](https://github.com/opensearch-project/index-management/pull/356))
+* Refactors shrink action steps and adds unit tests ([#349](https://github.com/opensearch-project/index-management/pull/349))
+
+### Infrastructure
+* Replace checked-in ZIPs with dynamic dependencies ([#327](https://github.com/opensearch-project/index-management/pull/327))
+* Only download JS zip when integTest is running ([#334](https://github.com/opensearch-project/index-management/pull/334))
+
+### Documentation
+* Updated issue templates from .github. ([#324](https://github.com/opensearch-project/index-management/pull/324))
+
+### Maintenance
+* Upgrades Index Management to use 2.0.0-alpha1 of OpenSearch and dependencies ([#318](https://github.com/opensearch-project/index-management/pull/318))
+* Make sure qualifier default is alpha1 in IM ([#323](https://github.com/opensearch-project/index-management/pull/323))
+* Incremented version to 2.0-rc1. ([#331](https://github.com/opensearch-project/index-management/pull/331))
+* Non-inclusive nonmenclature update ([#337](https://github.com/opensearch-project/index-management/pull/337))
+* Removes rc1 qualifier ([#353](https://github.com/opensearch-project/index-management/pull/353))