Adding a security policy.

Author: computate

SECURITY.md

@@ -0,0 +1,15 @@
+# Security Policy
+
+## Supported Versions
+
+Use this section to tell people about which versions of your project are
+currently being supported with security updates.
+
+| Version   | Supported          |
+| --------- | ------------------ |
+| 4.3.3.x   | :white_check_mark: |
+
+## Reporting a Vulnerability
+
+You can report a vulnerability here https://github.com/computate-org/computate/security/advisories?state=Triage
+