WIP. Add CI.

[lorenzo-gomez-windhover]

Adds necessary config for squeaky-weasel CI. Closes #23.

[codecov-commenter]

Codecov Report

❗ No coverage uploaded for pull request base (develop@01d019b). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             develop     #135   +/-   ##
==========================================
  Coverage           ?   81.13%           
==========================================
  Files              ?       70           
  Lines              ?    14708           
  Branches           ?        0           
==========================================
  Hits               ?    11933           
  Misses             ?     2775           
  Partials           ?        0           

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