Create SECURITY.md

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+The following versions of Tally Arbiter are currently being supported with security updates:
+
+| Version | Supported          |
+| ------- | ------------------ |
+| 3.0.x   | :white_check_mark: |
+| < 3.0.x | :x:                |
+
+## Reporting a Vulnerability
+
+To report a vulnerability, please file an issue request [here](http://github.com/josephdadams/tallyarbiter/issues/new).
+
+We take all security issues seriously and will try to issue a hotfix as soon as possible. This project is very community-friendly, so if you know how to fix it, please file a pull request yourself!
+Go check out our [Code of Conduct](https://github.com/josephdadams/TallyArbiter/blob/master/CODE_OF_CONDUCT.md) and get started.