updated README doc to specify security reporting instructions

Author: Warren Chu

README.md

@@ -242,6 +242,10 @@ This project has adopted the [Microsoft Open Source Code of Conduct](https://ope
 For more information see the [Code of Conduct FAQ](https://opensource.microsoft.com/codeofconduct/faq/) or
 contact [[email protected]](mailto:[email protected]) with any additional questions or comments.
 
+## Security Reporting Instructions
+
+For security reporting instructions please refer to the SECURITY.md file in this repository.
+
 ## Trademarks
 
 This project may contain trademarks or logos for projects, products, or services. Authorized use of Microsoft