Added simple pause feature and stripped trailing whitespace

Still a bug when unpaused, where the snake doesn't continue moving
forward.
Started bug list at bottom of file
Tidied up file, added to bug list
Renamed to config.yaml, fixed it
Added Command+Q to quit; Now pulls settings from config.yaml
Cleaned up directory, added README.md
Added to README.md
Outputs "dead" during the game instead of when you quit
Fixed bugs

- prints "dead" on start of game
- the snake does not grow until the tail reaches where the apple was
- when unpaused the tail immediately moves forward but the head does not
When snake dies pauses game and displays "You died!"
Started shift to grid layout system