Create SECURITY.md

Author: Hugo-ter-Doest

SECURITY.md

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+# Security Policy
+
+##
+
+We run dependabot and Github's CodeQL analysis to detect security problems.
+
+## Supported Versions
+
+Use this section to tell people about which versions of your project are
+currently being supported with security updates.
+
+| Version | Supported          |
+| ------- | ------------------ |
+| 5.1.10   | :white_check_mark: |
+| 5.0.x   | :x:                |
+| 4.0.x   | :x: |
+| < 4.0   | :x:                |
+
+## Reporting a Vulnerability
+
+If you find a vulnerability please report a security issue in the Issues section of the repository. If you know how to fix it, create a pull request.
+
+We will analyse the issue, and repair it a.s.a.p.