Add tag and untag commands

[SuhailLoya]

fixes #113

[SuhailLoya]

tests will be added by #115

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 1.80180% with 109 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
.../java/careconnect/logic/commands/UntagCommand.java	0.00%	39 Missing :warning:
...in/java/careconnect/logic/commands/TagCommand.java	0.00%	36 Missing :warning:
...ava/careconnect/logic/parser/TagCommandParser.java	0.00%	14 Missing :warning:
...a/careconnect/logic/parser/UntagCommandParser.java	0.00%	14 Missing :warning:
...va/careconnect/logic/parser/AddressBookParser.java	0.00%	2 Missing :warning:
...java/careconnect/logic/commands/AddLogCommand.java	0.00%	1 Missing :warning:
...a/careconnect/logic/commands/DeleteLogCommand.java	0.00%	1 Missing :warning:
.../careconnect/logic/parser/AddLogCommandParser.java	0.00%	1 Missing :warning:
...reconnect/logic/parser/DeleteLogCommandParser.java	0.00%	1 Missing :warning:

Files with missing lines	Coverage Δ	Complexity Δ
src/main/java/careconnect/logic/LogicManager.java	84.84% <ø> (ø)	6.00 <0.00> (ø)
src/main/java/careconnect/logic/Messages.java	87.50% <ø> (ø)	3.00 <0.00> (ø)
...ava/careconnect/logic/parser/AddCommandParser.java	100.00% <100.00%> (ø)	4.00 <0.00> (-1.00)
...main/java/careconnect/logic/parser/ParserUtil.java	70.58% <100.00%> (+0.58%)	15.00 <1.00> (+1.00)
...java/careconnect/logic/commands/AddLogCommand.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...a/careconnect/logic/commands/DeleteLogCommand.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
.../careconnect/logic/parser/AddLogCommandParser.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...reconnect/logic/parser/DeleteLogCommandParser.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...va/careconnect/logic/parser/AddressBookParser.java	80.00% <0.00%> (-6.96%)	13.00 <0.00> (ø)
...ava/careconnect/logic/parser/TagCommandParser.java	0.00% <0.00%> (ø)	0.00 <0.00> (?)
... and 3 more