Create SECURITY.md

Author: aldas

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          |
+| ------- | ------------------ |
+| 5.x.x   | :white_check_mark:               |
+| > 4.15.x   | :white_check_mark: |
+| < 4.0   | :x:                |
+
+## Reporting a Vulnerability
+
+At the moment look for maintainers email(s) in commits and email them.