Update usage

README.md

@@ -34,9 +34,10 @@ Vintern-1B-v2-ViTable-docvqa is a fine-tuned version of the 5CD-AI/Vintern-1B-v2
 
 <!-- Code benchmark: to be written later -->
 
-<!-- To be written later ## Usage
+## Usage
 
-You can use this notebook <a href="https://colab.research.google.com/"> <img src="https://colab.research.google.com/img/colab_favicon_256px.png" width="30"></a> -->
+Check out this [**🤗 HF Demo**](https://huggingface.co/spaces/YuukiAsuna/Vintern-1B-v2-ViTable-docvqa), or you can open it in Colab:  
+[![Open In Colab](https://colab.research.google.com/assets/colab-badge.svg)](https://colab.research.google.com/drive/1ricMh4BxntoiXIT2CnQvAZjrGZTtx4gj?usp=sharing)
 
 **Citation:**