Establish proper method for reporting security issues.

Author: cppwfs

SECURITY.md

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+# Security Policy
+## Reporting a Vulnerability
+
+If you think you have found a security vulnerability, please **DO NOT** disclose it publicly until we’ve had a chance to fix it.
+Please don’t report security vulnerabilities using GitHub issues, instead head over to https://spring.io/security-policy and learn how to disclose them responsibly.