Add DETR readme.md

[ZwwWayne]

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[codecov]

Codecov Report

Merging #4206 (ffdd63f) into master (8179440) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #4206   +/-   ##
=======================================
  Coverage   62.59%   62.59%           
=======================================
  Files         232      232           
  Lines       17597    17597           
  Branches     2942     2942           
=======================================
  Hits        11014    11014           
  Misses       6046     6046           
  Partials      537      537           

Flag	Coverage Δ
unittests	62.55% <ø> (ø)

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