Add references to the original game

README.md

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 Strategic board game where you can oppose your opponent, friend or AI, with walls.
 
+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
 
 I developed this project with 3 other students during my second year in prepa school in order to take the competitive exam named _TIPE_. The purpose of this project was **designing AI** for the strategic game Quoridor.