Update README.md

Author: SebLague

README.md

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 A fairly simple chess program, implementing in C# in the Unity game engine.
 
 [Watch video](https://www.youtube.com/watch?v=U4ogK0MIzqk)
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 [Download and play](https://sebastian.itch.io/chess-ai)
 ![Image](https://github.com/SebLague/Images/blob/master/Chess.png)