You will require a server backend for the portrayed setup.
It looks like you want to be able to share the levels, and have others play them, rate them etc etc,
You will need a location where this information gets stored, cs3 is not able to do this by itself.
I would suggest a regular webserver to serve and store the game/app and extra files, and use PHP MySql to store related information and imagery.
you would require some PHP scripts to:
Storing images on the server (or in database as blob)
Store player generated level in database (array.asjason to a Sql table entry)
Store players information ranging from ratings to scores in various tables.
Retrieve various information from server and SQL: images, scores, ratings
When you have this, you can either create an "admin" like app to manage the infromation added by players on the server, or simply use phpmyadmin or a custom php page for it.