All my tests of C++ and SFML library
- add ambiance music
- add multiplayer feature
- add options to specify number range
- add hall of fame
- fix collision bugs
- add hall of fame
- remove death when the snake hit the side
- add a border for all sides
- add a grid
- fix collision bugs
- add bonus
- add collision between missile and alien
- limit missile number by second
- add missile send by aliens
- add points and life