Slightly modified combobox template colors
Added basic image background to AddWindow and changed its layout. Also added small versions of BG images to project.
Now using Messenger class to send a new Game from AddGameWindow to the MainViewModel, which has GiantBombAPI
Added mainviewmodel logic to update games list after game added to json. Added LogError method to GiantBombAPI and added a trycatch for interpreting an API blob that came back empty (