release notes for 2.16 (#174)

Signed-off-by: Sarthak Aggarwal <sarthagg@amazon.com>
(cherry picked from commit 1387718)
Signed-off-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

Author: github-actions[bot]

release-notes/opensearch-custom-codecs.release-notes-2.16.0.0.md

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+## 2024-06-12 Version 2.16.0.0
+
+Compatible with OpenSearch 2.16.0
+
+### Features
+
+* Validating QAT Hardware Support before QAT Codecs are available