Add readme for integration tests

[binodmx]

Purpose

This PR adds instructions on running/debugging integration tests locally.

[codecov-commenter]

Codecov Report

Patch coverage has no change and project coverage change: +0.51 🎉

Comparison is base (5ed5ce0) 33.91% compared to head (30d1378) 34.43%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1155      +/-   ##
==========================================
+ Coverage   33.91%   34.43%   +0.51%     
==========================================
  Files         348      172     -176     
  Lines       39627    19885   -19742     
  Branches    12534     6342    -6192     
==========================================
- Hits        13440     6847    -6593     
+ Misses      25947    12918   -13029     
+ Partials      240      120     -120     

Flag	Coverage Δ
adapter	26.68% <ø> (-0.01%)	⬇️
admin-domain-service	56.37% <ø> (+1.09%)	⬆️
backoffice-domain-service	50.29% <ø> (ø)
devportal-domain-service	51.66% <ø> (ø)
idp-domain-service	80.10% <ø> (-1.00%)	⬇️
runtime-domain-service	31.80% <ø> (+0.47%)	⬆️

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see 188 files with indirect coverage changes

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