Can we add CSS support?

Hi,

I tried but facing issues with enabling CSS in the boilerplate.

Issue type :-
/Users/mohit/Documents/isomorphic-react/src/app.css:1
.p {
^
SyntaxError: Unexpected token .

I do want to support below stuff :-

1. CSS / SCSS with / without CSS module
2. Combined CSS using https://webpack.js.org/plugins/mini-css-extract-plugin/
3. Require help to understand such modules to render on NODE/Server side.