more setup instructions for `privategpt` example

examples/privategpt/README.md

@@ -4,10 +4,18 @@
 
 ### Setup
 
+Install the Python dependencies:
+
 ```shell
 pip install -r requirements.txt
 ```
 
+Pull the model you'd like to use:
+
+```
+ollama pull llama2-uncensored
+```
+
 ### Getting WeWork's latest quarterly report
 
 ```