Create SECURITY.md

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+Use this section to tell people about which versions of your project are
+currently being supported with security updates.
+
+| Version | Supported          |
+| ------- | ------------------ |
+| 1.3.x   | :white_check_mark: |
+| < 1.3   | :x:                |
+
+## Reporting a Vulnerability
+
+At this time, security issues and vulnerabilities in Docile should
+be reported like any other issue. Please create an issue in the
+[public issue tracker](https://github.com/ms-ati/docile/issues) on
+Github.