Unit conversions sketch

[jonnyh404]

Starts a template for implementation of unit conversions.

Exact pulls of the unit conversions values will ideally be pulled from a repository/module rather than hard coded constants.

[codecov]

Codecov Report

Attention: Patch coverage is 82.22222% with 8 lines in your changes missing coverage. Please review.

Project coverage is 93.36%. Comparing base (c1eb818) to head (c19d5ca).
Report is 3 commits behind head on master.

Files	Patch %	Lines
ResSimpy/Units/Units.py	58.33%	5 Missing ⚠️
ResSimpy/Units/convert_units.py	90.90%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #359      +/-   ##
==========================================
- Coverage   93.42%   93.36%   -0.06%     
==========================================
  Files         169      171       +2     
  Lines       12099    12155      +56     
==========================================
+ Hits        11303    11349      +46     
- Misses        796      806      +10     

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