Add an example about how to load images under app/javascript/images in the generated file (#1976)

Author: guilleiguaran

lib/install/javascript/packs/application.js

@@ -7,4 +7,12 @@
 // To reference this file, add <%= javascript_pack_tag 'application' %> to the appropriate
 // layout file, like app/views/layouts/application.html.erb
 
+
+// Uncomment to copy all static images under ../images to the output folder and reference
+// them with the image_pack_tag helper in views (e.g <%= image_pack_tag 'rails.png' %>)
+// or the `imagePath` JavaScript helper below.
+//
+// const images = require.context('../images', true)
+// const imagePath = (name) => images(name, true)
+
 console.log('Hello World from Webpacker')