add import statements to quick start

[kevinawoo]

This allows users to easily copy and paste the test case example.

[mdelapenya]

Thanks for taking the time to add this contribution.

Looks great!

[codecov]

Codecov Report

Merging #408 (b748ad7) into master (c0c2f90) will increase coverage by 0.17%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #408      +/-   ##
==========================================
+ Coverage   65.05%   65.22%   +0.17%     
==========================================
  Files          19       19              
  Lines        1159     1159              
==========================================
+ Hits          754      756       +2     
+ Misses        301      299       -2     
  Partials      104      104              

Impacted Files	Coverage Δ
docker.go	65.58% <0.00%> (+0.38%)	⬆️

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