add some descriptions to README in workflow example

[MregXN]

Description

add some descriptions about workflow expamle which may be helpful for understanding it.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (e435efd) 66.53% compared to head (aaffc1f) 66.53%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1192   +/-   ##
=======================================
  Coverage   66.53%   66.53%           
=======================================
  Files         171      171           
  Lines        5752     5752           
  Branches      626      626           
=======================================
  Hits         3827     3827           
  Misses       1776     1776           
  Partials      149      149           

Flag	Coverage Δ
net6	66.52% <ø> (ø)
net7	66.52% <ø> (ø)
net8	66.52% <ø> (ø)

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