Add README in French

[MargauxMasson]

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[github-actions]

Locust summary

Git references

Initial: e890baf
Terminal: 9fd065f

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[codecov]

Codecov Report

Merging #640 (9fd065f) into master (e890baf) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #640   +/-   ##
=======================================
  Coverage   89.14%   89.14%           
=======================================
  Files          55       55           
  Lines        3935     3935           
=======================================
  Hits         3508     3508           
  Misses        427      427           

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