Added readme.md

Added comments on the description of Expectimax evaluation function

Modified .gitignore

Implemented reflex evaluation function with full mark

Evaluation function can now achieve 6/6

Better evaluation function could achieve 5/6

Better 4/6

Better Evaluation Function 9/10

Implemented MiniMax Search, Alpha-Beta Pruning, and Expectimax Search. Also added reflex evaluation with less than perfect score

Initial commit