Add security policy

.github/SECURITY.md

@@ -0,0 +1,11 @@
+## Security Policy
+
+### Supported Versions
+
+Sherlock is a forward looking project. Only the latest and most current version is supported.
+
+### Reporting a Vulnerability
+
+Security concerns can be submitted [__here__][report-url] without risk of exposing sensitive information. For issues that are low severity or unlikely to see exploitation, public issues are often acceptable.
+
+[report-url]: https://github.com/sherlock-project/sherlock/security/advisories/new