Create SECURITY.md

Author: simonkoeck

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+| Version | Supported          |
+| ------- | ------------------ |
+| > 0.4.1   | :white_check_mark: |
+| < 0.4.1   | :x:                |
+
+Security updates are available since v0.4.1
+
+## Reporting a Vulnerability
+
+If you discover a security vulnerability, we ask you to report it to us with an issue.
+
+Thanks for your contribution.