Create SECURITY.md

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+`coord-sim` is not actively developed at the moment and no new features are expected for now.
+The same goes for security updates.
+
+`coord-sim` is meant for reasearch and best used in an isolated environment. 
+
+We will certainly try to fix reported issues, but there are no guarantees or warranties.
+
+
+## Reporting a Vulnerability
+
+Best to report security vulnerabilities in GitHub issues or directly fix them with a pull request.