Create SECURITY.md

.github/SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+Security updates are released for the latest `<major.minor.patch>` version only.
+
+Older releases will not be maintained.
+
+| Version | Supported          |
+| ------- | ------------------ |
+| latest  | :white_check_mark: |
+| < latest| :x:                |
+
+## Reporting a Vulnerability
+
+Please report (suspected) security vulnerabilities to **[ptrumpis@pm.me](mailto:ptrumpis@pm.me)**.
+You will receive a response from me as fast as possible.
+If the issue is confirmed, I will release a patch as soon as possible depending on complexity but historically within a few days.