Added cost analysis documentation

[glen-84]

Summary of the changes (Less than 80 chars)

• Added cost analysis documentation.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.82%. Comparing base (91fc947) to head (d2a4bfd).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7406      +/-   ##
==========================================
- Coverage   78.71%   77.82%   -0.89%     
==========================================
  Files        2433     2813     +380     
  Lines      119847   140996   +21149     
==========================================
+ Hits        94337   109735   +15398     
- Misses      25510    31261    +5751     

Flag	Coverage Δ
unittests	77.82% <ø> (-0.89%)	⬇️

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