22 create system phase species conditions classes

[K20shores]

Added stub system, phase, species, conditions classes as well as very basic tests

closes #22

[codecov-commenter]

Codecov Report

Base: 100.00% // Head: 100.00% // No change to project coverage 👍

Coverage data is based on head (8a38b5a) compared to base (8a38b5a).
Patch has no changes to coverable lines.

❗ Current head 8a38b5a differs from pull request most recent head 24585bc. Consider uploading reports for the commit 24585bc to get more accurate results

Additional details and impacted files

@@                      Coverage Diff                       @@
##           18-hard-coded-chapman-solver       #23   +/-   ##
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  Coverage                        100.00%   100.00%           
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  Files                                 1         1           
  Lines                                 2         2           
==============================================================
  Hits                                  2         2           

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