Update README.md

README.md

@@ -30,7 +30,12 @@ It was trained under the generative classification framework via explicit traini
 
 ## Usage
 
-You can use the model like this:
+Install our [python package](https://pypi.org/project/zeroshot-classifier/): 
+```bash
+pip install zeroshot-classifier
+```
+
+Then, you can use the model like this:
 
 ```python
 >>> import torch