Update installation instructions

README.md

@@ -31,8 +31,12 @@ That is, the Vendi Score is equal to the exponential of the von Neumann entropy
 ## How to Use
 The Vendi Score is available as a Python package or in HuggingFace `evaluate`.
 To use the Python package, see the instructions at https://github.com/vertaix/Vendi-Score.
-To use the `evaluate` module, pass a list of samples and a similarity function or a string identifying a predefined class of similarity functions (see below).
-
+To use the `evaluate` module, first install the requirements:
+```
+pip install evaluate
+pip install vendi_score[all]
+```
+To calculate the score, pass a list of samples and a similarity function or a string identifying a predefined class of similarity functions (see below).
 ```
 >>> vendiscore = evaluate.load("danf0/vendiscore")
 >>> samples = ["Look, Jane.",