minimax (#947)

* minimax.py

minimax algorithm is used for game like tic tac toe. It traces the path and selects the optimal move.

* minimax.py

Minimax is used in decision making and game theory to find the optimal move for a player, when your opponent also plays optimally. It is widely used in games like Tic-Tac-Toe, Chess.

* Delete minimax.py

* Update minimax.py

* Minimax is a backtracking algorithm that is used in game theory to find the optimal move for a player, assuming that your opponent also plays optimally