Update Release Notes for GA (#36)

* Update Release Notes for GA

* Update Release Notes for GA include RC1 Changes as well.

Signed-off-by: Aditya Jindal <[email protected]>

Author: adityaj1107

release-notes/opensearch-common-utils.release-notes-1.0.0.0.md

@@ -0,0 +1,29 @@
+## Version 1.0.0.0 2021-07-01
+
+Compatible with OpenSearch 1.0.0
+
+### Enhancements 
+
+  * Notification plugin interface and models ([#31](https://github.com/opensearch-project/common-utils/pull/31))
+
+### Infrastructure
+
+  * Support for kotlin and JUnit5 with mockito ([#29](https://github.com/opensearch-project/common-utils/pull/29))
+  * Removing Kotlin Runtime library bundled into library ([#30](https://github.com/opensearch-project/common-utils/pull/30))
+  * Bump to version 1.0.0.0 #34 ([#34](https://github.com/opensearch-project/common-utils/pull/34))
+
+### Documentation
+
+  * Update OpenSearch branch to 1.0 ([#28](https://github.com/opensearch-project/common-utils/pull/28)) 
+  * Cleanup READMEs. ([#32](https://github.com/opensearch-project/common-utils/pull/32))
+
+### Maintainence
+
+  * Update issue template with multiple labels ([#18](https://github.com/opensearch-project/common-utils/pull/18))
+  * Rename namespaces from OpenDistro to OpenSearch ([#20](https://github.com/opensearch-project/common-utils/pull/20))
+  * Rename classes, variables, methods to incorporate OpenSearch ([#21](https://github.com/opensearch-project/common-utils/pull/21))
+  * Rename remaining identifiers to OpenSearch ([#23](https://github.com/opensearch-project/common-utils/pull/23))
+  * Version changed to rc1 #24 ([#24](https://github.com/opensearch-project/common-utils/pull/24))
+  * Rename consts as per changes in security plugin ([#25](https://github.com/opensearch-project/common-utils/pull/25))
+  * Move workflow tags to rc1 ([#26](https://github.com/opensearch-project/common-utils/pull/26))
+  * Add rc1 release notes ([#27](https://github.com/opensearch-project/common-utils/pull/27))