Create SECURITY.md

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+This fork does not release jars with proper semantic versioning as there
+are not many breaking changes (if any) between the releases.
+
+For this reason, only the latest version is supported, and if there are
+issues, they should also be tested with this version.
+
+## Reporting a Vulnerability
+
+Send me an email: nico.mexis@kabelmail.de
+
+I will try to respond to you as soon as possible (sometimes, it could
+take some days, but I *will* contact you back; I have university and
+am maintaining this fork in my free time).