Add appointments to person

[SuhailLoya]

fixes #116

adds an appointment date field to person and a setappointment command to set / unset appointment date

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 16.66667% with 95 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...econnect/logic/commands/SetAppointmentCommand.java	0.00%	35 Missing :warning:
...java/careconnect/model/person/AppointmentDate.java	28.57%	12 Missing and 3 partials :warning:
...nect/logic/parser/SetAppointmentCommandParser.java	0.00%	14 Missing :warning:
...main/java/careconnect/logic/parser/ParserUtil.java	0.00%	6 Missing :warning:
...in/java/careconnect/model/util/SampleDataUtil.java	0.00%	6 Missing :warning:
...in/java/careconnect/storage/JsonAdaptedPerson.java	50.00%	4 Missing and 1 partial :warning:
src/main/java/careconnect/model/person/Person.java	57.14%	1 Missing and 2 partials :warning:
...java/careconnect/logic/commands/AddLogCommand.java	0.00%	2 Missing :warning:
...a/careconnect/logic/commands/DeleteLogCommand.java	0.00%	2 Missing :warning:
...in/java/careconnect/logic/commands/TagCommand.java	0.00%	2 Missing :warning:
... and 4 more

Files with missing lines	Coverage Δ	Complexity Δ
src/main/java/careconnect/logic/LogicManager.java	84.84% <ø> (ø)	6.00 <0.00> (?)
src/main/java/careconnect/logic/Messages.java	88.88% <100.00%> (ø)	3.00 <0.00> (?)
...n/java/careconnect/logic/commands/EditCommand.java	97.67% <100.00%> (ø)	13.00 <0.00> (?)
...ava/careconnect/logic/parser/AddCommandParser.java	100.00% <100.00%> (ø)	4.00 <0.00> (?)
src/main/java/careconnect/MainApp.java	0.00% <0.00%> (ø)	0.00 <0.00> (?)
...va/careconnect/logic/parser/AddressBookParser.java	76.92% <0.00%> (ø)	13.00 <0.00> (?)
src/main/java/careconnect/ui/PersonCard.java	0.00% <0.00%> (ø)	0.00 <0.00> (?)
...java/careconnect/logic/commands/AddLogCommand.java	0.00% <0.00%> (ø)	0.00 <0.00> (?)
...a/careconnect/logic/commands/DeleteLogCommand.java	0.00% <0.00%> (ø)	0.00 <0.00> (?)
...in/java/careconnect/logic/commands/TagCommand.java	0.00% <0.00%> (ø)	0.00 <0.00> (?)
... and 8 more

[SuhailLoya]

tests will be added by #118