Main Menu, Play Game Scene

Added features:

Design of main menu: by Dimitrios Savvaidis
Implementation of the above: by Charalampos Aristomenopoulos

Scenery: by Charalampos Aristomenopoulos & George Rovolis
Throwing a luck dart: by Charalampos Aristomenopoulos & George Rovolis
Drunk visual effect: by George Rovolis

Further details & readjustments-fixes: by Charalampos Aristomenopoulos
(that is why the whole project was uploaded only by Charalampos
Aristomenopoulos)