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

[royhodson]

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