Create SECURITY.md

Author: schaechinger

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+This package is still in development until version 1.0.0 is released.
+
+Until then only the latest 0.x release is supported.
+
+| Version | Supported          |
+| ------- | ------------------ |
+| 0.5.x   | :white_check_mark: |
+| < 0.5   | :x:                |
+
+## Reporting a Vulnerability
+
+You can send me a [mail](mailto:code@schaechinger.com) and I will fix the issue or get in contact with you within 72 hours.
+
+Thanks for your support! :heart: