Lack of Documentation for `OpenAI.FineTuning`

### Confirm this is a feature request for the .NET library and not the underlying OpenAI API

- [X] This is a feature request for the .NET library

### Describe the feature or improvement you are requesting

There isn't any documentation available on how to use the `OpenAI.FineTuning` functionality. 

### Additional context

_No response_