add a few climate models

[rabernat]

Actually it looks like the new CLIMA model does not list a license...

Checklist for new projects:

• [ ] The project is open-source and accessible.
• [x] Searched the existing entries to make sure this is not a duplicate.
• [x] Contains only a single addition (make separate PRs if adding more than one).
• [x] Added the link to the bottom of the relevant category.
• [x] Add icon from the media/icon/ folder if applicable (like ![Python](media/icon/python.png) ).
• [x] Created a new category only if necessary.
• [x] Checked spelling and grammar.
• [x] Removed trailing whitespace and periods.
• [ ] Confirm the dash – is not a minus -.
• [ ] Used title-casing (AP style) for project name.

[jhamman]

@rabernat - are these models not open source? Wondering why you left the top check box empty.