feat: add Litracer docs in readme

[deependujha]

Before submitting

• Was this discussed/agreed via a Github issue? (no need for typos and docs improvements)
• Did you read the contributor guideline, Pull Request section?
• Did you make sure to update the docs?
• Did you write any new necessary tests?

What does this PR do?

Fixes # (issue).

PR review

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[codecov]

Codecov Report

Attention: Patch coverage is 90.90909% with 1 line in your changes missing coverage. Please review.

Project coverage is 79%. Comparing base (efc5786) to head (d82be1a).
Report is 1 commits behind head on main.

Additional details and impacted files

@@         Coverage Diff         @@
##           main   #549   +/-   ##
===================================
  Coverage    79%    79%           
===================================
  Files        40     40           
  Lines      6081   6081           
===================================
  Hits       4803   4803           
  Misses     1278   1278           

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[tchaton]

Really nice !