Add opensearch-perftop 1.0.0.0-rc1 release note (#11)

Co-authored-by: Harold Xiao <[email protected]>

release-notes/opensearch-perftop.release-notes-1.0.0.0-rc1.md

@@ -0,0 +1,17 @@
+## Version 1.0.0.0-rc1 Release Notes
+
+Compatible with OpenSearch 1.0.0-rc1
+### Enhancements
+* Add env.js to store global property ([#10](https://github.com/opensearch-project/perftop/pull/10))
+
+### Infrastructure
+* Update version to rc1 ([#10](https://github.com/opensearch-project/perftop/pull/10))
+
+### Maintenance
+* Upgrade the version of vulnerable dependencies ([#8](https://github.com/opensearch-project/perftop/pull/8))
+* Add REST API backward compatibility ([#10](https://github.com/opensearch-project/perftop/pull/10))
+
+### Documentation
+* Update issue template with multiple labels([#7](https://github.com/opensearch-project/perftop/pull/7))
+* Update OpenSearch documents link ([#9](https://github.com/opensearch-project/perftop/pull/9))
+* Update REST endpoint in document ([#10](https://github.com/opensearch-project/perftop/pull/10))