Update README.md

README.md

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 - **Language(s):** PGN (Chess Notation)
 - **License:** MIT
 - **Related Paper:** "Compositions of relations with Transformers"
-- **GitHub Repository:** [https://github.com/l-pommeret/chess_char_test](https://github.com/l-pommeret/chess_char_test)
+- **GitHub Repository:** [![GitHub](https://img.shields.io/badge/GitHub-Repo-181717?logo=github)](https://github.com/l-pommeret/chess_char_test)
 - **Colab Notebook:** [![Open In Colab](https://colab.research.google.com/assets/colab-badge.svg)](https://colab.research.google.com/drive/129J3E6uJASrDLH7TsgOzFdSjAtvNPVRY?usp=sharing)
 
 ## Intended Use