`profsea-climate` - Add documentation

[gregrmunday]

A great next step with ProFSea would be to add comprehensive documentation for users and future developers.

Steps here include:

• Create a PR with locally-buildable documentation (using Sphinx, or VitePress for something nice and modern?)
• Ensure all functions and classes have appropriate and informative docstrings, and general code is usefully commented
• All functions/classes use appropriate type hints
• Example code blocks and expected outputs (sample plots, etc.)
• A Home and Install page for ProFSea, appropriate for both users and developers.

Soon, we should aim to set up GitHub Actions in order to deploy the documentation to a webpage, and aim to get ProFSea onto Conda and Pypi!

Hemant Khatri (@hmkhatri) anything else you can think of to get started?

[hmkhatri]

Greg Munday (@gregrmunday) Thanks for putting the list together. You have covered everything.