Add sort command for tutorial 2

[nananakx-x]

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[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (379dbee) 75.26% compared to head (8a4817b) 75.33%.

Additional details and impacted files

@@             Coverage Diff              @@
##             master       #2      +/-   ##
============================================
+ Coverage     75.26%   75.33%   +0.07%     
- Complexity      419      424       +5     
============================================
  Files            71       72       +1     
  Lines          1338     1350      +12     
  Branches        126      126              
============================================
+ Hits           1007     1017      +10     
- Misses          301      302       +1     
- Partials         30       31       +1     

Files	Coverage Δ
...java/seedu/address/logic/commands/SortCommand.java	100.00% <100.00%> (ø)
src/main/java/seedu/address/model/AddressBook.java	84.37% <100.00%> (+1.04%)	⬆️
src/main/java/seedu/address/model/Model.java	100.00% <ø> (ø)
...rc/main/java/seedu/address/model/ModelManager.java	100.00% <100.00%> (ø)
...a/seedu/address/model/person/UniquePersonList.java	87.50% <100.00%> (+0.54%)	⬆️
.../seedu/address/logic/parser/AddressBookParser.java	90.47% <0.00%> (-9.53%)	⬇️

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