[README] Add section on how to report issues

Author: Jeehut

README.md

@@ -91,6 +91,10 @@ the Swift compiler source because we always push gyb-generated files to a tag.
 
 [**Muter**](https://github.com/SeanROlszewski/muter): Automated mutation testing for Swift
 
+### Reporting Issues
+
+If you should hit any issues while using SwiftSyntax, we appreciate bug reports on [bugs.swift.org](https://bugs.swift.org) in the [SwiftSyntax component](https://bugs.swift.org/issues/?jql=component%20%3D%20SwiftSyntax).
+
 ## Contributing
 
 ### Building SwiftSyntax from `master`