include uglifyjs command guidelines for contributers

Author: mikegreiling

README.md

@@ -118,6 +118,14 @@ Note that when specifying these options as html data-attributes, you should conv
 	</tbody>
 </table>
 
+## Contributing
+
+If you have a pull request you would like to submit, please ensure that you update the minified version of the library along with your code changes.  This project uses [uglifyjs]() to perform code compression.
+
+Please use the following command:
+
+		uglifyjs parallax.js --comments -m -c -o parallax.min.js
+
 
 LICENSE
 =======