Add release notes for version 1.2.0.0 (#92)

* Add release notes for version 1.2.0.0

Signed-off-by: Ashish Agrawal <ashisagr@amazon.com>
Signed-off-by: Zelin Hao <zelinhao@amazon.com>

release-notes/opensearch-common-utils.release-notes-1.2.0.0.md

@@ -0,0 +1,14 @@
+## Version 1.2.0.0 2021-11-05
+
+Compatible with OpenSearch 1.2.0
+
+### Infrastructure
+
+  * Updates common-utils version to 1.2 ([#77](https://github.com/opensearch-project/common-utils/pull/77))
+  * Update maven publication to include cksums. ([#91](https://github.com/opensearch-project/common-utils/pull/91))
+
+### Documentation
+
+  * Add themed logo to README ([#41](https://github.com/opensearch-project/common-utils/pull/41)) 
+  * Update copyright notice ([#90](https://github.com/opensearch-project/common-utils/pull/90))
+  * Add release notes for version 1.2.0.0 ([#92](https://github.com/opensearch-project/common-utils/pull/92))