Add jldoctest

[AshlinHarris]

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[codecov]

Codecov Report

Merging #72 (1c009a9) into main (1e5a006) will not change coverage.
The diff coverage is n/a.

❗ Current head 1c009a9 differs from pull request most recent head abe7648. Consider uploading reports for the commit abe7648 to get more accurate results

@@            Coverage Diff            @@
##              main       #72   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines           58        58           
=========================================
  Hits            58        58           

Impacted Files	Coverage Δ
src/PreprocessMD.jl	100.00% <ø> (ø)

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