Leaderboard router + dinamic use of socket.IO room

+ added external router for leaderboard request page
+ now use room dynamically created on the fly from client API_KEY when a
user of this client request a leaderboard
+ Modif client-0, added input to send API KEY and connnect to a
specifique Leaderboard

+ deleted ciircle.js and approuter.js which were some personnal test