Create SECURITY.md

Author: TimothyGillespie

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+| Version | Supported          |
+| ------- | ------------------ |
+| 0.3.1   | :white_check_mark: |
+| < 0.3.1   | :x:                |
+
+## Reporting a Vulnerability
+
+You can report a vunerability to timothy[at]gillespie.eu. I encourage the use of my public key which you can find here:
+https://gist.github.com/TimothyGillespie/613c48b3c2fce6e5cb6a8b3e47a7557a