Update Setup section in Ollama.md

Update the Setup section in Ollama.md to explain how to use `ollamaChat.models` to find out which models are installed.

Author: MiriamScharnke

doc/Ollama.md

@@ -25,6 +25,11 @@ Connecting to Ollama models using this add\-on requires an installed version of
 >> !ollama pull mistral
 ```
 
+For information on which Ollama models you have installed, use the `models` method of the `ollamaChat` class:
+```matlab
+listOfAvailableModels = ollamaChat.models;
+```
+
 <a id="get-started"></a>
 # Get Started