Fix success message for Add Command

[erv-teo]

Change message to display correct fields, add a newline to each field, and add titles to fields for stored contacts.

[codecov]

Codecov Report

Attention: Patch coverage is 71.42857% with 4 lines in your changes are missing coverage. Please review.

Project coverage is 75.52%. Comparing base (938fb4c) to head (c220065).
Report is 2 commits behind head on master.

Files	Patch %	Lines
src/main/java/seedu/address/ui/PersonCard.java	0.00%	4 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master      #32      +/-   ##
============================================
+ Coverage     75.47%   75.52%   +0.04%     
  Complexity      460      460              
============================================
  Files            75       75              
  Lines          1513     1516       +3     
  Branches        154      154              
============================================
+ Hits           1142     1145       +3     
  Misses          323      323              
  Partials         48       48              

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[iamtr]

LGTM!