List organizations #123

A different angle on package comparison is to focus on GitHub organizations and their main packages.

There is an "official" list of about 120 organizations here: https://julialang.org/community/organizations/

Here's a script that finds 840 organizations from the general registry: https://gist.github.com/technocrat/c004c203d33a1ca2db5c0f6ff3813a20. (Ref

Ref #111