Update README.md

Author: afshinm

README.md

@@ -1,4 +1,16 @@
-intro.js
+Intro.js
 ========
 
-A better way for new feature introduction
+A better way for new feature introduction and step-by-step users guide for your website and project.
+
+##How to use
+Simple 3 steps.
+
+1) Include `intro.js` and `introjs.css` (or minified version for production) in your page.
+
+2) Add `data-intro` and `data-step` to your HTML elements.  
+For example: 
+```html
+<a href='http://google.com/' data-intro='Hello step one!' data-step='1'></a>
+````
+