Tutorial adding command

[weiseng18]

Tutorial 2

• updated test cases
• fixed checkstyle
• no new test cases

[codecov]

Codecov Report

Attention: Patch coverage is 45.34884% with 47 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...va/seedu/address/logic/commands/RemarkCommand.java	0.00%	24 Missing ⚠️
...eedu/address/logic/parser/RemarkCommandParser.java	0.00%	9 Missing ⚠️
.../java/seedu/address/model/util/SampleDataUtil.java	0.00%	6 Missing ⚠️
...c/main/java/seedu/address/model/person/Remark.java	75.00%	2 Missing and 1 partial ⚠️
...c/main/java/seedu/address/model/person/Person.java	71.42%	1 Missing and 1 partial ⚠️
...java/seedu/address/logic/commands/EditCommand.java	90.00%	0 Missing and 1 partial ⚠️
.../seedu/address/logic/parser/AddressBookParser.java	0.00%	1 Missing ⚠️
src/main/java/seedu/address/ui/PersonCard.java	0.00%	1 Missing ⚠️

Files with missing lines	Coverage Δ	Complexity Δ
...a/seedu/address/logic/parser/AddCommandParser.java	100.00% <100.00%> (ø)	5.00 <0.00> (ø)
...ain/java/seedu/address/logic/parser/CliSyntax.java	85.71% <100.00%> (+2.38%)	1.00 <0.00> (ø)
...in/java/seedu/address/logic/parser/ParserUtil.java	97.43% <100.00%> (+0.21%)	15.00 <1.00> (+1.00)
.../java/seedu/address/storage/JsonAdaptedPerson.java	100.00% <100.00%> (ø)	12.00 <0.00> (+1.00)
...java/seedu/address/logic/commands/EditCommand.java	96.47% <90.00%> (-0.97%)	13.00 <0.00> (ø)
.../seedu/address/logic/parser/AddressBookParser.java	90.47% <0.00%> (-9.53%)	12.00 <0.00> (ø)
src/main/java/seedu/address/ui/PersonCard.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...c/main/java/seedu/address/model/person/Person.java	95.00% <71.42%> (-2.23%)	20.00 <1.00> (+1.00)	⬇️
...c/main/java/seedu/address/model/person/Remark.java	75.00% <75.00%> (ø)	4.00 <4.00> (?)
.../java/seedu/address/model/util/SampleDataUtil.java	20.00% <0.00%> (ø)	1.00 <0.00> (ø)
... and 2 more