Project description in the README

[thehenster]

It would be useful for first time visiters to https://github.com/webpack-contrib/expose-loader to explain what expose-loader does.

The npmjs page does a decent job with "The expose loader adds modules to the global object. This is useful for debugging, or supporting libraries that depend on libraries in globals."

(see https://www.npmjs.com/package/expose-loader)

The README could do with an explaination about what the project does.

I hope this doesn't come across as flippant.. Thank you for your work!