docs: add security policy (#283)

Author: thisisharsh7

SECURITY.md

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+# Reporting Security Issues
+
+If you believe you have found a security vulnerability in CodeBuff, we encourage you to let us know right away. We will investigate all legitimate reports and do our best to quickly fix the problem.
+
+Email us at: `support@codebuff.com`
+
+Please do not report security vulnerabilities through public GitHub issues.