Add information about npm scripts

[junosuarez]

Addresses #9

[migurski]

You run a node program by calling npm start?

[junosuarez]

yep. npm start is an alias of npm run start, and npm test is an alias of npm run test, and you can add arbitrary other scripts in package.json which are called by npm run <script>

[migurski]

Got it, thanks. Seemed weird to use a package manager to run things, but okay.

[junosuarez]

Not really any different than with go build go test go get etc. npm is the primary cli interface to node. npm is such an integral part of Node.js - I suppose it's different in other ecosystems with multiple package managers which evolved separately from the platform core.

[migurski]

That makes sense; it's interesting to me how the path dependencies of different languages evolve.