Update Find command to search using Person's IC

[jiahui0309]

Added support for usage of find command (Closes #10). This PR covers:

• New Class (IdentityCardNumberMatchesPredicate) to support searching of IC in FindCommand Class.
• Ensuring that the parsing of arguments with the command word find is updated with the new class.
• Updating Unit tests to ensure that FindCommand runs and throws errors where necessary.
• The program can compile and run without a problem.

If one of these points above still has an issue please let me know. The FindCommand Class now looks like this:

Note:

• The command has yet to be tried on the actual interface as the AddCommand has to be updated first.

[codecov]

Codecov Report

Attention: Patch coverage is 77.27273% with 5 lines in your changes are missing coverage. Please review.

Project coverage is 73.09%. Comparing base (dfcbf36) to head (53dac0a).

Files	Patch %	Lines
.../seedu/address/logic/parser/FindCommandParser.java	40.00%	3 Missing ⚠️
...del/person/IdentityCardNumberMatchesPredicate.java	81.81%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##             master      #46   +/-   ##
=========================================
  Coverage     73.08%   73.09%           
- Complexity      453      460    +7     
=========================================
  Files            75       76    +1     
  Lines          1464     1483   +19     
  Branches        145      147    +2     
=========================================
+ Hits           1070     1084   +14     
- Misses          352      356    +4     
- Partials         42       43    +1     

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[tengcharmaine]

LGTM!