Update AddCommand to AddProjectCommand

[Lin-Shuang-Shuang]

No description provided.

[modembcc]

This version failed the checks. I've commented on the places the checks failed.

[codecov]

Codecov Report

Attention: Patch coverage is 95.23810% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 72.01%. Comparing base (302615f) to head (5cecfc6).
Report is 2 commits behind head on master.

Files	Patch %	Lines
.../address/logic/parser/AddProjectCommandParser.java	87.50%	1 Missing ⚠️
...c/main/java/seedu/address/model/person/Person.java	87.50%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master      #22      +/-   ##
============================================
- Coverage     75.26%   72.01%   -3.25%     
+ Complexity      419      385      -34     
============================================
  Files            71       71              
  Lines          1338     1265      -73     
  Branches        126      114      -12     
============================================
- Hits           1007      911      -96     
- Misses          301      319      +18     
- Partials         30       35       +5     

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[modembcc]

LGTM. The codecov test didn't pass, but we can fix it in the next week.