how the hell am I supposed to build this? Add installation notes for collaborators

[pistonsky]

If you follow readme, you get nothing: running webpack-dev-server will raise error like "webpack-dev-server command is not found", then just webpack will complain that it doesn't have all the required modules, even if I do npm install beforehand.

So, please, explain how to install and get everything to work to all the collaborators willing to work on both front/backend.