Add a link to the documentation from the README

[parker-research]

Is there documentation for this library available? If so, could you please add a link to the README?

If there's no documentation beyond what's currently in the README, it would be really valuable to create it in a proper documentation format, which explains all the valid options. It might be a bit redundant of the Ollama server/API documentation, but it would be much easier to read/use.