Create SECURITY.md

SECURITY.md

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+# Security Policy
+
+We take security very seriously in mangos, since you may be using it in
+Internet-facing applications.
+
+## Supported Versions
+
+Use this section to tell people about which versions of your project are
+currently being supported with security updates.
+
+| Version | Supported          |
+| ------- | ------------------ |
+| 3.x   | :white_check_mark: |
+| 2.x   | :white_check_mark: |
+| 1.x   | :x:  (serious issues only, we recommend everyone use mangos 3.x)              |
+
+## Reporting a Vulnerability
+
+To report a vulnerability, please contact us on our discord.
+You may also send an email to [email protected], or [email protected].
+
+We will keep the reporter updated on any status updates on a regular basis,
+and will respond within two business days for any reported security issue.