Add security policy

Author: tablackburn

SECURITY.md

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+# Security Policy
+
+## Reporting a Vulnerability
+
+If you discover a security vulnerability in this project, please report it responsibly:
+
+1. **Do NOT open a public issue** for security vulnerabilities
+2. Instead, use GitHub's private security advisory feature:
+   - Navigate to the "Security" tab of this repository
+   - Click "Report a vulnerability"
+
+This allows us to assess and address the vulnerability before it becomes public knowledge.
+
+## Supported Versions
+
+Security updates are provided for the latest release only.