Feat: Add leave

[nixonwidjaja]

No description provided.

[codecov]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (6a3a32e) 75.46% compared to head (fb864db) 77.92%.
Report is 4 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master      #62      +/-   ##
============================================
+ Coverage     75.46%   77.92%   +2.46%     
- Complexity      471      536      +65     
============================================
  Files            79       82       +3     
  Lines          1565     1735     +170     
  Branches        155      186      +31     
============================================
+ Hits           1181     1352     +171     
+ Misses          333      327       -6     
- Partials         51       56       +5     

Files	Coverage Δ
src/main/java/seedu/address/logic/Messages.java	90.90% <ø> (ø)
.../java/seedu/address/logic/commands/AddCommand.java	100.00% <ø> (ø)
...a/seedu/address/logic/parser/AddCommandParser.java	100.00% <100.00%> (ø)
.../seedu/address/logic/parser/AddressBookParser.java	90.90% <100.00%> (+0.43%)	⬆️
...ain/java/seedu/address/logic/parser/CliSyntax.java	91.66% <100.00%> (+0.75%)	⬆️
...seedu/address/logic/parser/LeaveCommandParser.java	100.00% <100.00%> (ø)
...rc/main/java/seedu/address/model/person/Leave.java	100.00% <100.00%> (ø)
...c/main/java/seedu/address/model/person/Person.java	98.33% <100.00%> (+2.77%)	⬆️
.../java/seedu/address/model/util/SampleDataUtil.java	0.00% <ø> (ø)
.../java/seedu/address/storage/JsonAdaptedPerson.java	100.00% <100.00%> (ø)
... and 2 more

... and 8 files with indirect coverage changes

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[sheryew]

The success command for adding leave is too long and unreadable.
Perhaps shorten the success response to something like:
Leave(s) successfully updated for employee: Alex Yeoh.
Added Leaves for January
Deleted leaves for Feb.

Something along that line

[sheryew]

LGTM!