Add namespaced packs feature to readme

[gauravtiwari]

Related to #201

[gauravtiwari]

@kuroda Is this looks fine to you - documentation for your PR?

[kuroda]

I think you should simply put <%= javascript_pack_tag 'app/calendar' %> here.

[gauravtiwari]

Thanks, will fix 👍

[kuroda]

@gauravtiwari

Well, it seems to be subtlely different from my intention.

I want to emphasize that we can have multiple JavaScript entry points with the same name:

app/javascript/packs/admin/orders.js
app/javascript/packs/shop/orders.js

and reference them in your views like this:

<%# app/views/admin/orders/index.html.erb %>
<%= javascript_pack_tag 'admin/orders' %>

and

<%# app/views/shop/orders/index.html.erb %>
<%= javascript_pack_tag 'shop/orders' %>

[gauravtiwari]

@kuroda got it 👍 thanks

[gauravtiwari]

@kuroda Updated the content. Reads fine to you?

[kuroda]

@gauravtiwari It seems to be perfect.