Improve documentation

[MicroDroid]

They documentation needs definitely to be more clear and have much better structure how to use this library. For example, I struggle to find how and where would I receive my authorization code. Also what does authenticate exactly do? open up a popup? what?

[philippeluickx]

This repo helped me a lot:
https://github.com/dgrubelic/vue-authenticate-site

[designbyadrian]

I can't even get past this:

import Vue from 'vue'
import { VueAuthenticate } from 'vue-authenticate'

console.log("VueAuthenticate",VueAuthenticate); // undefined

const vueAuthInstance = new VueAuthenticate(Vue.http, {
// ...

Without getting this error:

Uncaught TypeError: _vueAuthenticate.VueAuthenticate is not a constructor