Create SECURITY.md

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+Use this section to tell people about which versions of your project are
+currently being supported with security updates.
+
+| Version | Supported          |
+| ------- | ------------------ |
+| 2.0.x   | :white_check_mark: |
+| < 2.0   | :x:                |
+
+## Reporting a Vulnerability
+
+If you discover a security vulnerability or a bug that may be usable for reducing the performance of Imageflow or Imageflow Server, please email [email protected]. Please refrain from posting publicly until we have had a chance to verify the issue and issue an update.