DOCS: Add area for working with atmospheric/other geoscientific models

[VeckoTheGecko]

What version of Parcels are you running?

main

Is your feature request related to a problem?

I was looking at the sidebar in our user guide, and saw

I think it would be nice to have a section as well for working with atmospheric models. Basically we can have a page that is a TODO (and provides a logical place for an atmospheric scientist to contribute a notebook). Maybe we can link a tracking issue as well. Thoughts @erikvansebille ? I think it would make it clear that its an area we want to expand to

Describe the solution you'd like

see above

Describe alternatives you've considered

No response

Additional context

No response

[erikvansebille]

Yep, I agree it's a good idea to create a landing page for atmospheric models, with a tracking issue. Note that Jan Clemens got Parcels running on ERA5 data during the hackathon. I will ask him for his script!