Update README.md

Add introduction, features.

Author: tanakaworld

README.md

@@ -2,3 +2,39 @@
 
 # google-spreadsheets-parser
 Simple Google Spreadsheets parser for JavaScript
+
+## Introduction
+
+1. Create new Google Spreadsheet
+
+  ![intro-1](https://raw.githubusercontent.com/wiki/TanakaYutaro/google-spreadsheets-parser/img/intro-1.png)
+
+
+2. Publish spreadsheet
+
+  ![intro-2](https://raw.githubusercontent.com/wiki/TanakaYutaro/google-spreadsheets-parser/img/intro-2.png)
+
+  You can show following tables from [published url](https://docs.google.com/spreadsheets/d/1vyPu1EtzU1DvGXfthjrR-blJ8mGe75TL4BFNWtFMm0I/pubhtml)
+
+  ![intro-3](https://raw.githubusercontent.com/wiki/TanakaYutaro/google-spreadsheets-parser/img/intro-3.png)
+  
+3. Import googleSpreadsheetsParser.js in header
+  
+  ```html
+  <script type="text/javascript" src="/path/to/googleSpreadsheetsParser.js"></script>
+  ```
+  
+4. Get data
+
+  ```javascript
+  var gss = new GoogleSpreadsheetsParser(publishedUrl, true);
+  
+  console.log(gss.titles);          // ["ID", "Name", "Age"]
+  console.log(gss.contents);        // [Array[3], Array[3], Array[3], Array[3], Array[3]]
+  console.log(gss.contents[2][1]);  // Doug
+  ```
+
+## Features
+
+* `.titles` : Table titles array in the frst row.
+* `.contents` : Table data 2d array in the second row later.