How to use folder as local npm package

Issue #657

Add library folder src/library

src
    library
        res.js
    screens
        Home
            index.js
package.json

Declare package.json in library folder

{
    "name": "library",
    "version": "0.0.1"
}

Declare library as dependency in root package.json

"dependencies": {
    "library": "file:src/library"
},

Now import like normal, for example in src/screens/Home/index.js

import res from 'library/res'