Add Earthdata Search

[mschmele]

Project name: Earthdata Search

Project website/repository:

• http://search.earthdata.nasa.gov
• https://github.com/nasa/earthdata-search License:

Checklist for new projects:

• [x] 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.
• [ ] 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 -.
• [x] Used title-casing (AP style) for project name.

[rabernat]

Thanks @mschmele!