Added Ollama Model Check for installed models #140
Merged
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Before calling the ollama chat function , the code is fetching the list of installed models on the system and checks if the selected model is present in the list if not then gives instructions on how to install the ollama model and also the list of installed models on the system.


Also added error handling for the case when the ollama service is not running then display the error accordingly to the user.
Issue #89