Add multipart parser docs

[codecov[bot]]

Codecov Report

Merging #34 (00989bb) into master (a1dbf0a) will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##            master       #34   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           24        24           
  Lines         1829      1829           
=========================================
  Hits          1829      1829           

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