Add MarkAppointmentAsDone functionalities

[porkeypine]

No description provided.

[codecov-io]

Codecov Report

Merging #172 into master will increase coverage by 4.84%.
The diff coverage is 14.49%.

@@             Coverage Diff              @@
##             master     #172      +/-   ##
============================================
+ Coverage     54.14%   58.98%   +4.84%     
- Complexity      473      555      +82     
============================================
  Files            99      103       +4     
  Lines          1932     2048     +116     
  Branches        207      229      +22     
============================================
+ Hits           1046     1208     +162     
+ Misses          821      759      -62     
- Partials         65       81      +16     

Impacted Files	Coverage Δ	Complexity Δ
src/main/java/team/baymax/MainApp.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...n/java/team/baymax/commons/core/time/DateTime.java	91.30% <0.00%> (-4.16%)	12.00 <0.00> (+1.00)	⬇️
...n/java/team/baymax/logic/commands/ExitCommand.java	100.00% <ø> (ø)	3.00 <0.00> (ø)
...mmands/appointment/MarkAppointmentDoneCommand.java	0.00% <0.00%> (ø)	0.00 <0.00> (?)
...ymax/logic/commands/patient/AddPatientCommand.java	92.85% <ø> (ø)	9.00 <0.00> (ø)
...x/logic/commands/patient/DeletePatientCommand.java	92.85% <ø> (ø)	8.00 <0.00> (ø)
...max/logic/commands/patient/FindPatientCommand.java	91.66% <ø> (ø)	7.00 <0.00> (ø)
...eam/baymax/logic/parser/AppointmentBookParser.java	66.66% <0.00%> (-6.07%)	12.00 <0.00> (ø)
...ointment/ListPatientAppointmentsCommandParser.java	0.00% <0.00%> (ø)	0.00 <0.00> (?)
.../appointment/MarkAppointmentDoneCommandParser.java	0.00% <0.00%> (ø)	0.00 <0.00> (?)
... and 28 more

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