Update README.md

README.md

@@ -14,6 +14,7 @@ Details will be available soon.
 For more information, please contact [email protected] (Dương) / [email protected] (Thành) / [email protected] (Bình).
 
 ### How to use
+```python
 from transformers import AutoTokenizer, AutoModelForCausalLM
 
 tokenizer = AutoTokenizer.from_pretrained("VietAI/gpt-j-6B-vietnamese-news")
@@ -34,4 +35,5 @@ gen_tokens = model.generate(
     )
 
 gen_text = tokenizer.batch_decode(gen_tokens)[0]
-print(gen_text)
+print(gen_text)
+```