Create SECURITY.md

Author: teon

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+These versions are currently being supported with security updates:
+
+| Version | Supported          |
+| ------- | ------------------ |
+| 1.0.x   | :white_check_mark: |
+
+## Reporting a Vulnerability
+
+Please do **not open a Github Issue for security issues you encounter**.
+To reporting a vulnerability open a [security advisory here](https://github.com/defguard/defguard/security/advisories/new).