Create SECURITY.md (#175)

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+The latest version of this software will be updated with security fixes if required.
+
+## Reporting a Vulnerability
+
+Reporting of a vulneribility is performed via the standard github private vulnerability reporting mechanism.
+
+## Design for Security
+
+Please visit the High Level Design document for further details on the security design of these libraries
+[HLD-Security](https://github.com/intel/ad-rss-lib/blob/master/doc/ad_rss/HLD-Security.md)