Modify UG

[Mohammed-Faizzzz]

Modify UG to Address Edge cases associated with add-doctor command.

[codecov]

Codecov Report

Merging #220 (423b723) into master (4fa3adc) will increase coverage by 3.08%.
Report is 4 commits behind head on master.
The diff coverage is 85.71%.

@@             Coverage Diff              @@
##             master     #220      +/-   ##
============================================
+ Coverage     72.28%   75.37%   +3.08%     
- Complexity      725      756      +31     
============================================
  Files           112      112              
  Lines          2555     2530      -25     
  Branches        275      272       -3     
============================================
+ Hits           1847     1907      +60     
+ Misses          601      530      -71     
+ Partials        107       93      -14     

Files	Coverage Δ
.../address/logic/commands/AddAppointmentCommand.java	100.00% <ø> (+27.45%)	⬆️
...seedu/address/logic/commands/AddDoctorCommand.java	95.45% <ø> (+13.63%)	⬆️
src/main/java/seedu/address/model/AddressBook.java	78.12% <ø> (+6.48%)	⬆️
src/main/java/seedu/address/model/Model.java	100.00% <ø> (ø)
...a/seedu/address/model/appointment/Appointment.java	92.85% <ø> (+11.77%)	⬆️
.../main/java/seedu/address/model/person/Patient.java	93.02% <100.00%> (+4.65%)	⬆️
.../java/seedu/address/storage/JsonAdaptedDoctor.java	100.00% <100.00%> (ø)
...java/seedu/address/storage/JsonAdaptedPatient.java	100.00% <100.00%> (+6.25%)	⬆️
.../java/seedu/address/storage/JsonAdaptedPerson.java	100.00% <ø> (+10.00%)	⬆️
...rc/main/java/seedu/address/model/ModelManager.java	89.00% <75.00%> (+7.09%)	⬆️

... and 11 files with indirect coverage changes

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[kohkaijie]

LGTM! Resolved merge conflicts but will create another PR to fine tune the UG to combine both mine and Faiz's parts.

[cmHuang777]

Instructions at the add-doctor part seems a bit long, other than that looks good.