Add a security policy. (#393)

SECURITY.md

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+# Security and OpenCue
+
+The OpenCue Technical Steering Committee (TSC) takes security very
+seriously. We strive to design secure software, and utilize continuous 
+integration and code analysis tools to help identify potential 
+vulnerabilities.
+
+## Reporting Vulnerabilities
+
+Quickly resolving security related issues is a priority. If you think
+you've found a potential vulnerability in OpenCue, please report it by
+emailing <[email protected]>. Only TSC members and ASWF
+project management have access to these messages.
+
+Include detailed steps to reproduce the issue, and any other information that
+could aid an investigation. Someone will assess the report and make every
+effort to respond within 14 days.
+
+## Outstanding Security Issues
+
+None
+
+## Addressed Security Issues
+
+None