Add panel for appointments

[ya0-yuan]

Fixes #120

[codecov-io]

Codecov Report

Merging #121 into master will decrease coverage by 0.15%.
The diff coverage is 0.00%.

@@             Coverage Diff              @@
##             master     #121      +/-   ##
============================================
- Coverage     14.10%   13.94%   -0.16%     
  Complexity      159      159              
============================================
  Files           127      129       +2     
  Lines          2482     2510      +28     
  Branches        307      309       +2     
============================================
  Hits            350      350              
- Misses         2107     2135      +28     
  Partials         25       25              

Impacted Files	Coverage Δ	Complexity Δ
...rc/main/java/seedu/address/logic/LogicManager.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
src/main/java/seedu/address/ui/MainWindow.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
.../seedu/address/ui/appointment/AppointmentCard.java	0.00% <0.00%> (ø)	0.00 <0.00> (?)
...u/address/ui/appointment/AppointmentListPanel.java	0.00% <0.00%> (ø)	0.00 <0.00> (?)
.../main/java/seedu/address/ui/client/ClientCard.java	0.00% <ø> (ø)	0.00 <0.00> (?)
.../java/seedu/address/ui/client/ClientListPanel.java	0.00% <ø> (ø)	0.00 <0.00> (?)
.../seedu/address/ui/hairdresser/HairdresserCard.java	0.00% <ø> (ø)	0.00 <0.00> (?)
...u/address/ui/hairdresser/HairdresserListPanel.java	0.00% <ø> (ø)	0.00 <0.00> (?)

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[iamjamestan]

LGTM