Add add command

[timjkong]

Rename Phone class to Mobile in package seedu.address.model.friend
Add AddCommand classes in package seedu.address.logic.wanderlustlogic.wanderlustparser
Update WanderlustAddCommandParser
Update ParserUtil class in package seedu.address.logic.wanderlustlogic.wanderlustparser

[codecov-io]

Codecov Report

Merging #89 into master will decrease coverage by 1.79%.
The diff coverage is 5.12%.

@@             Coverage Diff              @@
##             master      #89      +/-   ##
============================================
- Coverage     44.73%   42.94%   -1.80%     
  Complexity      602      602              
============================================
  Files           148      153       +5     
  Lines          2754     2869     +115     
  Branches        332      351      +19     
============================================
  Hits           1232     1232              
- Misses         1453     1568     +115     
  Partials         69       69              

Impacted Files	Coverage Δ	Complexity Δ
...anderlustcommands/add/AddAccommodationCommand.java	0.00% <0.00%> (ø)	0.00 <0.00> (?)
...gic/wanderlustcommands/add/AddActivityCommand.java	0.00% <0.00%> (ø)	0.00 <0.00> (?)
...erlustlogic/wanderlustcommands/add/AddCommand.java	0.00% <0.00%> (ø)	0.00 <0.00> (?)
...logic/wanderlustcommands/add/AddFriendCommand.java	0.00% <0.00%> (ø)	0.00 <0.00> (?)
...c/wanderlustcommands/add/AddTravelPlanCommand.java	0.00% <0.00%> (ø)	0.00 <0.00> (?)
...ic/wanderlustlogic/wanderlustparser/CliSyntax.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...c/wanderlustlogic/wanderlustparser/ParserUtil.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...c/wanderlustparser/WanderlustAddCommandParser.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
.../wanderlustparser/WanderlustEditCommandParser.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
.../java/seedu/address/model/activity/Importance.java	66.66% <ø> (ø)	4.00 <0.00> (ø)
... and 11 more

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[jiaweiteo]

LGTM