doc: add SECURITY.md (#44)

Author: RafaelGSS

SECURITY.md

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+# Security Policy
+
+This document outlines the security policy for the Node.js Web Team repositories and infrastructure.
+
+## Reporting Security Vulnerabilities
+
+The Node.js Web Team follows the security policies and procedures of the Node.js project.
+
+For reporting security vulnerabilities in any Node.js Web Team repository or infrastructure, please refer to the official Node.js org security policy:
+
+**[https://github.com/nodejs/nodejs.org/blob/main/SECURITY.md](https://github.com/nodejs/nodejs.org/blob/main/SECURITY.md)**
+
+## Additional Resources
+
+- [Node.js Security Working Group](https://github.com/nodejs/security-wg)