Create SECURITY.md

Author: dbanty

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+Only the latest release is currently supported, we will not be backporting fixes as long as this project is in the unstable 0.x versioning.
+
+## Reporting a Vulnerability
+
+If you've discovered a vulnerability in this project, please report it to Dylan Anthony at [email protected]. I will create an advisory and add you 
+to the discussion / credit you with discovery.
+
+It's better not to create an issue in the repository unless it's already actively being exploited.