Create SECURITY.md

Author: skavanagh

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+| Version | Supported          |
+| ------- | ------------------ |
+| 3.13.x  | :white_check_mark: |
+
+## Reporting a Vulnerability
+
+If you’ve found a vulnerability, we would like to know so we can patch it.
+
+You can report security issues by sending an email to [email protected].