Create SECURITY.md (#120)

Author: lucacome

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+We advise users to use the most recent release of NGINX Plus Go Client library. This project is not covered by the NGINX Plus support contract.
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+## 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 F5SIRT@f5.com
+
+For more information visit https://www.f5.com/services/support/report-a-vulnerability