Caiyi34777 category implementation update

[Caiyi34777]

fix #70

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@82ab5b1). Click here to learn what that means.
The diff coverage is 84.97%.

@@            Coverage Diff            @@
##             master      #83   +/-   ##
=========================================
  Coverage          ?   73.02%           
  Complexity        ?      429           
=========================================
  Files             ?       74           
  Lines             ?     1327           
  Branches          ?      137           
=========================================
  Hits              ?      969           
  Misses            ?      320           
  Partials          ?       38           

Impacted Files	Coverage Δ	Complexity Δ
.../java/seedu/address/logic/commands/AddCommand.java	100.00% <ø> (ø)	8.00 <0.00> (?)
src/main/java/seedu/address/ui/PersonCard.java	0.00% <0.00%> (ø)	0.00 <0.00> (?)
.../java/seedu/address/model/util/SampleDataUtil.java	25.00% <25.00%> (ø)	2.00 <1.00> (?)
...c/main/java/seedu/address/model/person/Author.java	70.00% <70.00%> (ø)	5.00 <5.00> (?)
...in/java/seedu/address/logic/parser/ParserUtil.java	85.36% <75.00%> (ø)	14.00 <6.00> (?)
...in/java/seedu/address/model/category/Category.java	80.00% <80.00%> (ø)	5.00 <5.00> (?)
.../java/seedu/address/storage/JsonAdaptedPerson.java	91.93% <87.17%> (ø)	12.00 <12.00> (?)
...rc/main/java/seedu/address/model/person/Times.java	87.50% <87.50%> (ø)	6.00 <6.00> (?)
.../seedu/address/logic/parser/EditCommandParser.java	92.85% <90.00%> (ø)	11.00 <4.00> (?)
...c/main/java/seedu/address/model/person/Person.java	95.91% <91.30%> (ø)	23.00 <5.00> (?)
... and 8 more

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