Added connectfour file
Merge pull request #1 from kaitlin-farr/master

Update
Merge pull request #2 from kaitlin-farr/master

Update
Added some functionality to Connect Four game (keeps track of turn number, player color, allows players to make moves, allows players to see current state of the board)
Added functionality to check the end conditions and display the results.
Merge pull request #20 from jesheffield/master

merging code