Add logo in home page and orange color.
Game Overview : game homepage
Game Overview : comments  on unecessary methods
Add example of broad layout
Add logo_home_page and button orange and button sign in Google.
Add orange button in view. Change Sign in button in home page.
Merge branch '8_home_page' into develop
Merged feature/platform into develop
Refactored position handling of game entities
Implemented player switch management in game engine