Added readme

Author: Arnav-arw

Connect 4 with Minimax Algorithm/READme.md

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+This is a single player connect 4 game which used [Minimax algorithm](https://en.wikipedia.org/wiki/Minimax).
+
+Dependancies:
+1. Pygame 2.1.2
+2. Numpy 1.23.1
+
+Game Rules:
+
+Four consecutive balls should match of the same colour horizontally, vertically or diagonally (either of both) just like tic-tac-toe.
+That's it now u r ready to play the game :)