Osero

## Description

_Osero_ is an adaptation of the board game Othello. The player can play
against an AI opponent in two different difficulty levels. The player can
choose to play black or white and whether to start or not. The normal rules of
the game apply as player and AI take turns putting their pieces on the board
and trying to gain a majority control. Each collection of tokens flanked by
two tokens of the other colour change colour (horizontally, vertically or
diagonally).

Osero