Make final changes

[Mohammed-Faizzzz]

• Removed Status from Appointment due to decision not to use it
• Format Date and Time of Appointment
• Update UG

[codecov]

Codecov Report

Merging #156 (c7e2b78) into master (1da56dc) will decrease coverage by 0.21%.
The diff coverage is 50.00%.

@@             Coverage Diff              @@
##             master     #156      +/-   ##
============================================
- Coverage     66.13%   65.93%   -0.21%     
+ Complexity      660      658       -2     
============================================
  Files           113      113              
  Lines          2593     2580      -13     
  Branches        273      272       -1     
============================================
- Hits           1715     1701      -14     
- Misses          771      774       +3     
+ Partials        107      105       -2     

Files	Coverage Δ
.../seedu/address/storage/JsonAdaptedAppointment.java	61.29% <100.00%> (-0.88%)	⬇️
src/main/java/seedu/address/logic/Messages.java	61.53% <0.00%> (+4.39%)	⬆️
...a/seedu/address/model/appointment/Appointment.java	81.57% <66.66%> (-11.61%)	⬇️
...rc/main/java/seedu/address/ui/AppointmentCard.java	0.00% <0.00%> (ø)

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