Update README.md

README.md

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 # Tic-Tac-Toe
  Console-based version of Tic-Tac-Toe
+
+Some files are only necessary if you open the project in Code::Blocks
+If you are not using Code::Blocks simply compile main.cpp and run the executable to play the game
+
+Difficulties:
+Normal - CPU will choose a square on the grid at random, very easy to beat
+Impossible - Plays the optimum strategy for a 3x3 grid, should be unbeatable with the best outcome for the player being a draw (Not yet implemented)