Update README.md with security header

README.md

@@ -11,6 +11,10 @@ We leverage [Stack Overflow](http://stackoverflow.com/) to work with the communi
 
 We recommend you use the "adal" tag so we can see it! Here is the latest Q&A on Stack Overflow for ADAL: [http://stackoverflow.com/questions/tagged/adal](http://stackoverflow.com/questions/tagged/adal)
 
+## Security Reporting
+
+If you find a security issue with our libraries or services please report it to [[email protected]](mailto:[email protected]) with as much detail as possible. Your submission may be eligible for a bounty through the [Microsoft Bounty](http://aka.ms/bugbounty) program. Please do not post security issues to GitHub Issues or any other public site. We will contact you shortly upon receiving the information. We encourage you to get notifications of when security incidents occur by visiting [this page](https://technet.microsoft.com/en-us/security/dd252948) and subscribing to Security Advisory Alerts.
+
 ## Contributing
 
 All code is licensed under the Apache 2.0 license and we triage actively on GitHub. We enthusiastically welcome contributions and feedback. You can clone the repo and start contributing now.