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.x     | :white_check_mark: |
+| 1.x     | :x:                |
+
+## Reporting a Vulnerability
+
+Due to sensitive nature of security issues, we ask that they not be publicly reported using Github issues. Instead, if you believe 
+you’ve found something in Modoboa which has security implications, please send a description of the issue via email to security@modoboa.org.
+
+Once you’ve submitted an issue via email, you should receive an acknowledgment from the team as soon as possible, 
+and depending on the action to be taken, you may receive further followup emails.