Update README.md (#19275)

README.md

@@ -15,6 +15,10 @@ toolchain. Most developers will interact with Flutter via the [Flutter
 Framework](https://github.com/flutter/flutter), which provides a modern,
 reactive framework, and a rich set of platform, layout and foundation widgets.
 
+If you want to run/contribute to Flutter Web engine, more tooling can be 
+found at [felt](https://github.com/flutter/engine/tree/master/lib/web_ui/dev#whats-felt).
+This is a tool written to make web engine development experience easy.
+
 If you are new to Flutter, then you will find more general information
 on the Flutter project, including tutorials and samples, on our Web
 site at [Flutter.dev](https://flutter.dev). For specific information