Add security and support docs

SECURITY.md

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+# Security
+
+GitHub takes the security of our software products and services seriously,
+including all of the open source code repositories managed through our GitHub
+organizations, such as [GitHub](https://github.com/GitHub).
+
+Even though
+[open source repositories are outside of the scope of our bug bounty program](https://bounty.github.com/index.html#scope)
+and therefore not eligible for bounty rewards, we will ensure that your finding
+gets passed along to the appropriate maintainers for remediation.
+
+## Reporting Security Issues
+
+If you believe you have found a security vulnerability in any GitHub-owned
+repository, please report it to us through coordinated disclosure.
+
+**Please do not report security vulnerabilities through public GitHub issues,
+discussions, or pull requests.**
+
+Instead, please send an email to opensource-security[@]github.com.
+
+Please include as much of the information listed below as you can to help us
+better understand and resolve the issue:
+
+- The type of issue (e.g., buffer overflow, SQL injection, or cross-site
+  scripting)
+- Full paths of source file(s) related to the manifestation of the issue
+- The location of the affected source code (tag/branch/commit or direct URL)
+- Any special configuration required to reproduce the issue
+- Step-by-step instructions to reproduce the issue
+- Proof-of-concept or exploit code (if possible)
+- Impact of the issue, including how an attacker might exploit the issue
+
+This information will help us triage your report more quickly.
+
+## Policy
+
+See
+[GitHub's Safe Harbor Policy](https://docs.github.com/en/site-policy/security-policies/github-bug-bounty-program-legal-safe-harbor#1-safe-harbor-terms)

SUPPORT.md

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+# Support
+
+## How to file issues and get help
+
+This project uses GitHub issues to track bugs and feature requests. Please
+search the existing issues before filing new issues to avoid duplicates. For new
+issues, file your bug or feature request as a new issue.
+
+For help or questions about using this project, please file an issue.
+
+This project is under active development and maintained by GitHub staff and the
+community. We will do our best to respond to support, feature requests, and
+community questions in a timely manner.
+
+## GitHub Support Policy
+
+Support for this project is limited to the resources listed above.