Add security policy with contact details

rfc2822 · web-flow · commit da94a8ba0999 · 2023-07-14T22:33:00.000+02:00
diff --git a/SECURITY.md b/SECURITY.md
@@ -0,0 +1,5 @@
+# Security Policy
+
+## Reporting a Vulnerability
+
+Please report security vulnerabilities using the [DAVx⁵ support form](https://www.davx5.com/support) or via email to support@davx5.com.
