Add workflow config file through Actions tab

[hdoupe]

Added this file directly from this tab: https://github.com/PSLmodels/Behavioral-Responses/actions

Related: #81

[codecov-io]

Codecov Report

Merging #82 (ad4873c) into master (813eea3) will decrease coverage by 7.50%.
The diff coverage is n/a.

❗ Current head ad4873c differs from pull request most recent head 780e9ac. Consider uploading reports for the commit 780e9ac to get more accurate results

@@             Coverage Diff             @@
##            master      #82      +/-   ##
===========================================
- Coverage   100.00%   92.50%   -7.50%     
===========================================
  Files            2        3       +1     
  Lines          111      120       +9     
===========================================
  Hits           111      111              
- Misses           0        9       +9     

Flag	Coverage Δ
unittests	92.50% <ø> (?)

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Impacted Files	Coverage Δ
setup.py	0.00% <0.00%> (ø)

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