readme: document osrd-compose.sh

[Khoyo]

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 11.45%. Comparing base (9ba26e9) to head (595876e).

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Additional details and impacted files

@@              Coverage Diff              @@
##                dev    #7504       +/-   ##
=============================================
- Coverage     29.32%   11.45%   -17.88%     
=============================================
  Files          1196      612      -584     
  Lines        146995   104524    -42471     
  Branches       2889      976     -1913     
=============================================
- Hits          43109    11972    -31137     
+ Misses       102186    91583    -10603     
+ Partials       1700      969      -731     

Flag	Coverage Δ
core	?
editoast	?
front	9.75% <ø> (ø)
gateway	2.41% <ø> (ø)
railjson_generator	87.49% <ø> (ø)
tests	84.23% <ø> (ø)

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