Uses SFML Multimedia Library
Sounds: https://www.sounds-resource.com/mobile/flappybird/sound/5309/
Font: https://www.dafont.com/04b-19.font
Bird Image: https://www.pngfly.com/png-2qnorl/
Pipe Image: https://www.pngkey.com/detail/u2w7q8r5i1w7a9t4_flappy-bird-pipe-png-flappy-bird-pipe-transparent/
Background Image: http://data.whicdn.com/images/98904071/large.jpg