Create SECURITY.md

SECURITY.md

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+# Security Policy
+## Supported Versions
+
+The project is still under heavy development. Always use the latest version!
+This section will be updated when the code becomes less subject to changes.
+<!--
+| Version | Supported          |
+| ------- | ------------------ |
+| 5.1.x   | :white_check_mark: |
+| 5.0.x   | :x:                |
+| 4.0.x   | :white_check_mark: |
+| < 4.0   | :x:                |
+-->
+## Reporting a Vulnerability
+Open an issue explaining the vulnerability. I will try to fix it as fast as possible.
+Pull requests are also welcome!