[ISSUE-188] Add code documentation to Jiffy

[jama5262]

What does this PR do?

Add code documentation to Jiffy

Resolves #188

[codecov-commenter]

Codecov Report

Base: 96.16% // Head: 96.17% // Increases project coverage by +0.00% 🎉

Coverage data is based on head (bb44b8f) compared to base (cc88b2d).
Patch coverage: 93.75% of modified lines in pull request are covered.

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Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #189   +/-   ##
========================================
  Coverage    96.16%   96.17%           
========================================
  Files           34       34           
  Lines         1513     1515    +2     
========================================
+ Hits          1455     1457    +2     
  Misses          58       58           

Impacted Files	Coverage Δ
lib/src/display.dart	100.00% <ø> (ø)
lib/src/parser.dart	100.00% <ø> (ø)
lib/src/query.dart	100.00% <ø> (ø)
lib/src/utils/jiffy_exception.dart	100.00% <ø> (ø)
lib/src/jiffy.dart	98.75% <93.33%> (+<0.01%)	⬆️
lib/src/default_display.dart	100.00% <100.00%> (ø)

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