Create SECURITY.md

Author: samclarke

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+The latest version is supported.
+
+## Reporting a Vulnerability
+
+If you find or suspect a security vulnerability, please report it to sam@samclarke.com, and I will try to respond as quickly as possible.
+
+If possible, please include "Security vulnerability report:" in the subject line.