Feature/doc/javadoc

[wenshuoguo]

add missing javadocs.

[codecov[bot]]

Codecov Report

Merging #121 into develop will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##             develop    #121   +/-   ##
=========================================
  Coverage       60.6%   60.6%           
  Complexity       415     415           
=========================================
  Files             45      45           
  Lines           2450    2450           
  Branches         249     249           
=========================================
  Hits            1486    1486           
  Misses           890     890           
  Partials          74      74

Impacted Files	Coverage Δ	Complexity Δ
...atbot/src/main/java/database/keeper/LogKeeper.java	73.6% <ø> (ø)	6 <0> (ø)	:arrow_down:
...tbot/src/main/java/database/keeper/MenuKeeper.java	84.2% <ø> (ø)	7 <0> (ø)	:arrow_down:
...ing-chatbot/src/main/java/utility/MessageJSON.java	100% <ø> (ø)	4 <0> (ø)	:arrow_down:
...hatbot/src/main/java/database/querier/Querier.java	64.9% <ø> (ø)	34 <0> (ø)	:arrow_down:
...ng-chatbot/src/main/java/controller/Publisher.java	0% <ø> (ø)	0 <0> (ø)	:arrow_down:
...atbot/src/main/java/agent/IntentionClassifier.java	0% <ø> (ø)	0 <0> (ø)	:arrow_down:
...g-chatbot/src/main/java/agent/ImageMenuParser.java	83.7% <ø> (ø)	6 <0> (ø)	:arrow_down:
...atbot/src/main/java/utility/JazzySpellChecker.java	73.4% <ø> (ø)	7 <0> (ø)	:arrow_down:
...ing-chatbot/src/main/java/agent/UrlMenuParser.java	81.8% <ø> (ø)	8 <0> (ø)	:arrow_down:
...ing-chatbot/src/main/java/utility/JsonUtility.java	97.7% <ø> (ø)	11 <0> (ø)	:arrow_down:
... and 20 more

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