add readme for logrus integration

[ribice]

I noticed that README is missing in logging integrations (rest of them have it). If the format is fine, I'll create it for zerolog and slog as well.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.21%. Comparing base (72d6158) to head (bcaa013).
Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #901      +/-   ##
==========================================
- Coverage   83.27%   83.21%   -0.07%     
==========================================
  Files          55       55              
  Lines        5919     5897      -22     
==========================================
- Hits         4929     4907      -22     
  Misses        820      820              
  Partials      170      170              

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