Add 1.1.0 releasenotes draft md file (opensearch-project#478)

* Add 1.1.0 releasenotes draft md file

Signed-off-by: Peter Zhu <[email protected]>

* Update opensearch-release-notes-1.1.0.md

* Update opensearch-release-notes-1.1.0.md

* Update opensearch-release-notes-1.1.0.md

* Add the full url of the ccr plugins

* Update opensearch-release-notes-1.1.0.md

* Replace dash with star for release notes

Signed-off-by: Peter Zhu <[email protected]>

* Update opensearch-release-notes-1.1.0.md