Add ADMINS.md

Copied contents from template project.

Signed-off-by: Vijayan Balasubramanian <[email protected]>

Author: VijayanB

ADMINS.md

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+## Overview
+
+This document explains who the admins are (see below), what they do in this repo, and how they should be doing it. If you're interested in becoming a maintainer, see [MAINTAINERS](MAINTAINERS.md). If you're interested in contributing, see [CONTRIBUTING](CONTRIBUTING.md).
+
+## Current Admins
+
+| Admin           | GitHub ID                               | Affiliation |
+| --------------- | --------------------------------------- | ----------- |
+| Charlotte       | [CEHENKLE](https://github.com/CEHENKLE) | Amazon      |
+| Henri Yandell   | [hyandell](https://github.com/hyandell) | Amazon      |
+
+## Admin Responsibilities
+
+As an admin you own stewartship of the repository and its settings. Admins have [admin-level permissions on a repository](https://docs.github.com/en/organizations/managing-access-to-your-organizations-repositories/repository-permission-levels-for-an-organization). Use those privileges to serve the community and protect the repository as follows.
+
+### Prioritize Security
+
+Security is your number one priority. Manage security keys and safeguard access to the repository.
+
+Note that this repository is monitored and supported 24/7 by Amazon Security, see [Reporting a Vulnerability](SECURITY.md) for details.
+
+### Enforce Code of Conduct
+
+Act on [CODE_OF_CONDUCT](CODE_OF_CONDUCT.md) violations by revoking access, and blocking malicious actors.
+
+### Adopt Organizational Best Practices
+
+Adopt organizational best practices, work in the open, and collaborate with other admins by opening issues before making process changes. Prefer consistency, and avoid diverging from practices in the opensearch-project organization.