docs: add badges in readme

README.md

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 # Gymnasium 2048
 
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 Gymnasium environment for the [Game 2048](https://en.wikipedia.org/wiki/2048_(video_game)) and game-playing agents using
 temporal difference learning of n-tuple networks.
@@ -234,6 +239,7 @@ To cite the repository in publications:
 
 ## References
 
+- [Gymnasium](https://github.com/Farama-Foundation/Gymnasium)
 - [Szubert and Jaśkowski: Temporal Difference Learning of N-Tuple Networks
   for the Game 2048](https://www.cs.put.poznan.pl/wjaskowski/pub/papers/Szubert2014_2048.pdf)
 - [Guei and Wu: On Reinforcement Learning for the Game of 2048](https://arxiv.org/pdf/2212.11087.pdf)