usage examples added into readme

Author: sunra

README.md

@@ -13,3 +13,26 @@ Extract contents from HTML in a single line.
 
 http://simplehtmldom.sourceforge.net/
 
+
+Install
+-------
+
+ composer.phar require
+  - package name: "sunra/php-simple-html-dom-parser": "dev-master"
+
+
+Usage
+-----
+
+'''php
+use Sunra\PhpSimple\HtmlDomParser;
+
+...
+$dom = HtmlDomParser::str_get_html( $str );
+or 
+$dom = HtmlDomParser::file_get_html( $file_name );
+
+$elems = $dom->find($elem_name);
+...
+
+'''