feat: Add additional code docs

[duffn]

Closes #1

[codecov-commenter]

Codecov Report

Patch and project coverage have no change.

Comparison is base (2168e39) 100.00% compared to head (e5b1ccc) 100.00%.

❗ Current head e5b1ccc differs from pull request most recent head 9bbb587. Consider uploading reports for the commit 9bbb587 to get more accurate results

Additional details and impacted files

@@            Coverage Diff            @@
##              main        #7   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           28        28           
  Lines          400       400           
=========================================
  Hits           400       400           

Impacted Files	Coverage Δ
lib/harkness/error.rb	100.00% <ø> (ø)
lib/harkness/models/base/data_container.rb	100.00% <ø> (ø)
lib/harkness/models/base/data_wrapper.rb	100.00% <ø> (ø)
lib/harkness/models/base/summary.rb	100.00% <ø> (ø)
lib/harkness/models/character.rb	100.00% <ø> (ø)
lib/harkness/models/comic.rb	100.00% <ø> (ø)
lib/harkness/models/creator.rb	100.00% <ø> (ø)
lib/harkness/models/event_list.rb	100.00% <ø> (ø)
lib/harkness/models/image.rb	100.00% <ø> (ø)
lib/harkness/models/series.rb	100.00% <ø> (ø)
... and 4 more

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