Create SECURITY.md

Author: ArtyomResh

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+| Version   | Supported          |
+| --------- | ------------------ |
+| > 3.3.x   | :white_check_mark: |
+
+## Reporting a Vulnerability
+
+Please report (suspected) security vulnerabilities to security@csssr.com. Use https://github.com/qtm.gpg to encrypt your message.
+You will receive a response from us when we get to the issue. If the issue is confirmed, we will release a patch as soon as possible depending on complexity.
+Thank you!