Add security policy

SECURITY.md

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+# Security Policy
+
+## General Guidance
+
+We advise users to run the most recent release of the NGINX S3 Gateway, and we issue software updates to the most recent release.
+
+## Support
+
+The NGINX S3 Gateway in and of itself is an unsupported example of a collection of NGINX configuration, containers and njs scripts.
+However, NGINX itself is supported.
+
+## Reporting a Vulnerability
+
+The F5 Security Incident Response Team (F5 SIRT) has an email alias that makes it easy to report potential security vulnerabilities.
+
+- If you’re an F5 customer with an active support contract, please contact [F5 Technical Support](https://www.f5.com/services/support).
+- If you aren’t an F5 customer, please report any potential or current instances of security vulnerabilities with any F5 product to the F5 Security Incident Response Team at [email protected]
+
+For more information visit https://www.f5.com/services/support/report-a-vulnerability