Improvement on user interface design, index.html update

Changes:

- JqueryMobile library is used for designing user interface.
- Main client logic index.html is now compatible with the server. It now uses connectToServer() method of the server for connecting to the server, and sends messages to other clients with servers' sendRecommendRequest() method. Lastly, it implements the method getRecommendRequest() for getting requests from other users.

A more brief explanation about the above mentioned methods, can be found in README.md file, on the section "Some notes on usage".