chore: make basic guide using OpenAI SDK with LFAI API

[jalling97]

Describe what should be investigated or refactored

LeapfrogAI is compatible with the OpenAI API endpoints, so when performing development tasks leveraging LeapfrogAI, one can use the OpenAI SDK instead of interfacing with the API directly via requests.

A short guide should be written that shows how to do this, along with some examples and links to the OpenAI API documentation. Also the guide should note that not all endpoints are implemented in LFAI.

This guide should be part of the LeapfrogAI docs site.

Additional context

• OpenAI documentation