Color format the code snippet in model card (#31)

- Color format the code snippet in model card (8cb1b04a60ab1d9f9781b63cbc642c58668e996d)


Co-authored-by: Sugato Ray <sugatoray@users.noreply.huggingface.co>

README.md

@@ -24,7 +24,7 @@ Training recipe:
 
 - GitHub: https://github.com/apple/ml-diffucoder
 
-```
+```py
 import torch
 from transformers import AutoModel, AutoTokenizer