Create SECURITY.md

Closes #4

Author: RickdeJager

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+Please only report issues that are present in the latest commit on the master branch.
+
+## Reporting a Vulnerability
+As this is an A/D CTF tool, most people will not run long-term publicly reachable instances. As such, feel free to report security issues directly in the github issues tracker.  
+  
+ If you prefer an email contact, you can email `tulip-sec<at>bricked.tech`.