Update README.md

Author: sbstjn

README.md

@@ -30,6 +30,14 @@ new Timesheet('timesheet', 2002, 2013, [
 
 `$ > bower install https://github.com/sbstjn/timesheet.js.git`
 
+## Grunt commands
+
+Use `grunt` to build all JavaScript and StyleSheet files located inside `dist/`. 
+
+Use `grunt server` to start a local web server on [localhost:8080](http://localhost:8080) to customize Timesheet.js, afterwards run `grunt` to compile all needed files.
+
+Use `grunt gh` to generate the site and files available at [sbstjn.github.io/timesheet.js](http://sbstjn.github.io/timesheet.js) into the `gh-pages` folder.
+
 ## License
 
-Timesheet.js is licensed under MIT License.
+Timesheet.js is licensed under MIT License.