chore: added security policy documentation (#55)

Author: MadsRC

SECURITY.md

@@ -0,0 +1,13 @@
+# Security Policy
+
+## Supported Versions
+
+| Version | Supported          |
+|---------|--------------------|
+| < 1.0.x | :white_check_mark: |
+
+## Reporting a Vulnerability
+
+Vulnerabilities can be reported by opening an [issue on GitHub](https://github.com/MadsRC/sophrosyne/issues).
+
+Vulnerabilities that have been triaged and verified will carry the `vulnerability` label.