Add OpenSearch 1.0.0 Release Notes Here (opensearch-project#85)

* Add OpenSearch 1.0.0 Release Notes Here

Signed-off-by: Peter Zhu <zhujiaxi@amazon.com>

* Replace odfe references in org repo to opensearch-project

Signed-off-by: Peter Zhu <zhujiaxi@amazon.com>

* Revert "Replace odfe references in org repo to opensearch-project"

This reverts commit 0ab57a6.

Signed-off-by: Peter Zhu <zhujiaxi@amazon.com>

* Update opensearch-release-notes-1.0.0.md

* Update opensearch-release-notes-1.0.0.md

Add release notes for rc1 (opensearch-project#48)

* Add release notes for rc1

Signed-off-by: Sayali Gaikawad <gaiksaya@amazon.com>

Remove a typo (opensearch-project#29)

Signed-off-by: Peter Zhu <zhujiaxi@amazon.com>