Making it more obvious how to add extra stimulus controllers

Author: weaverryan

symfony/webpack-encore-bundle/1.0/assets/bootstrap.js

@@ -6,3 +6,6 @@ export const app = startStimulusApp(require.context(
     true,
     /\.(j|t)sx?$/
 ));
+
+// register any custom, 3rd party controllers here
+// app.register('some_controller_name', SomeImportedController);