add grunt.js build file (closes #235)

README.md

@@ -285,12 +285,19 @@ Then:
 3. Run ```node plugin/notes-server```
 
 
-## Folder Structure
+## Development Environment 
+
+reveal.js is built using the task-based command line build tool (grunt.js)[http://gruntjs.com]. Installation instructions here https://github.com/gruntjs/grunt#installing-grunt. With Node.js and grunt installed, you need to start by running ```npm install``` in the reveal.js root. When the dependencies have been installed you should run ```grunt watch``` to start monitoring files for changes.
+
+If you want to customize reveal.js without running grunt.js you can alter the HTML to point to the uncompressed source files (css/reveal.css/js/reveal.js).
+
+### Folder Structure
 - **css/** Core styles without which the project does not function
 - **js/** Like above but for JavaScript
 - **plugin/** Components that have been developed as extensions to reveal.js
 - **lib/** All other third party assets (JavaScript, CSS, fonts)
 
+
 ## License
 
 MIT licensed