Update documentation

[guncha]

A few issues were brought up:

• [ ] What's the usage in a modern ES6 environment?
• [ ] How to ensure the CSS files are added to the page when installing from NPM? Perhaps recommend something like style-loader from webpack.

[michshat]

Here how i used it in react project:

1. install libs npm install please-wait --save-dev npm install spinkit --save-dev

2. import references

   import 'please-wait/build/please-wait.css';
   import 'spinkit/css/spinners/5-pulse.css';
   import { pleaseWait } from 'please-wait';

3. initialize the component

   window.loading_screen = pleaseWait({
       logo: 'logo.png',
       backgroundColor: '#1DA57A',
       loadingHtml: "<p class='loading-message'>The application is getting ready ...</p><div class='sk-spinner sk-spinner-pulse'></div>"       
   });

4. dismiss the component

   window.loading_screen.finish();

   Hope that helps

[roy1196]

How can I init the var? exist an init method or start?