Merge pull request #481 from microsoft/security-md

Update SECURITY.md

Author: emmairwin

SECURITY.md

@@ -2,6 +2,13 @@
 
 ## Security
 
-Please review the latest Microsoft SECURITY.md guidance at [https://aka.ms/SECURITY.md](https://aka.ms/SECURITY.md).
+Microsoft takes the security of our software products and services seriously, which
+includes all source code repositories in our GitHub organizations.
+
+**Please do not report security vulnerabilities through public GitHub issues.**
+
+For security reporting information, locations, contact information, and policies,
+please review the latest guidance for Microsoft repositories at 
+[https://aka.ms/SECURITY.md](https://aka.ms/SECURITY.md).
 
 <!-- END MICROSOFT SECURITY.MD BLOCK -->