:art: Add logo

README.md

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 Strategic board game where you can oppose your opponent, friend or AI, with walls.
 
+![Wall logo](logo.png)
+
 The orignal game has been [designed by Gigamic](https://www.gigamic.com/jeu/quoridor). You can buy the wood game from a [game vendor](https://www.letempledujeu.fr/zoom20414.html).
 
 ## Context