Create SECURITY.md

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+As of today, I only support the latest version of ntfy. Please make sure you stay up-to-date.
+
+## Reporting a Vulnerability
+
+Please report severe security issues privately via ntfy@heckel.io, [Discord](https://discord.gg/cT7ECsZj9w),
+or [Matrix](https://matrix.to/#/#ntfy:matrix.org) (my username is `binwiederhier`).