updated readme to explain grunt server

README.textile

@@ -29,6 +29,16 @@ h4. Install with "bower":http://bower.io
 
 <pre>$ bower install jquery.lazyload</pre>
 
+h4. Run local Grunt test to see examples
+
+Install dependencies:
+* install "node.js":http://nodejs.org/
+* <pre>$ npm install -g grunt-cli</pre>
+* <pre>$ npm install</pre>
+
+Start server
+* <pre>$ grunt server</pre>
+
 h1. License
 
 All code licensed under the "MIT License":http://www.opensource.org/licenses/mit-license.php. All images licensed under "Creative Commons Attribution 3.0 Unported License":http://creativecommons.org/licenses/by/3.0/deed.en_US. In other words you are basically free to do whatever you want. Just don't remove my name from the source.