Add docs build process readme

[ppiegaze]

Tracking issue

Why are the changes needed?

What changes were proposed in this pull request?

How was this patch tested?

Setup process

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Check all the applicable boxes

• I updated the documentation accordingly.
• All new and existing tests passed.
• All commits are signed-off.

Related PRs

Docs link

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (0538efb) 58.19% compared to head (f375a15) 58.20%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #4772   +/-   ##
=======================================
  Coverage   58.19%   58.20%           
=======================================
  Files         626      626           
  Lines       53893    53893           
=======================================
+ Hits        31363    31368    +5     
+ Misses      20018    20015    -3     
+ Partials     2512     2510    -2     

Flag	Coverage Δ
unittests	58.20% <ø> (+<0.01%)	⬆️

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