Create SECURITY.md (#97)

SECURITY.md

@@ -0,0 +1,27 @@
+# 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          |
+| ------- | ------------------ |
+| 5.1.x   | :white_check_mark: |
+| 5.0.x   | :x:                |
+| 4.0.x   | :white_check_mark: |
+| < 4.0   | :x:                |
+-->
+
+## Reporting a Vulnerability
+
+<!--
+Use this section to tell people how to report a vulnerability.
+
+Tell them where to go, how often they can expect to get an update on a
+reported vulnerability, what to expect if the vulnerability is accepted or
+declined, etc.
+-->
+
+To report a security issue, please email [email protected] with a description of the issue, the steps you took to create the issue, affected versions, and, if known, mitigations for the issue. This project follows a 90 day disclosure timeline.