liverload less,scss

[letyougo]

If you are reporting a bug, please fill in below. Otherwise feel free to remove this template entirely.

Expected behavior

I hope to livereload the code,and can deal with less fill,scss file, so I hope to write some webpack codes . how to realize it ?

[gaearon]

Create React App does not currently support Less or SASS, as documented in README. If you need them, you may run their command line utilities yourself, and import the resulting CSS file into your project.

We might reevaluate this decision in a few months.
Please see the discussion in #78.

[gaearon]

This is now explained in the Sass integration documentation.