fix(react-router-busy): Add line about looking at the CSS file for what to style in your own app

GitOrigin-RevId: af868d115173f25aa0b892072e9fbb90e5496170

Author: f

.github/README.md

@@ -18,7 +18,7 @@ For use with [react-router](https://github.com/remix-run/react-router) 6+ or [re
 
 ## The solution
 
-If you'd like to see an example, check it out live on https://gitsell.dev
+If you'd like to see an example, check it out live on https://gitsell.dev. Also see react-router-busy/src/busy.module.css for an example of what to target to style the various busy states.
 
 ### BusyForm