Added Prescription add/delete/list commands

[huyuxin0429]

No description provided.

[codecov-commenter]

Codecov Report

Merging #136 (8239a8d) into master (2297f1c) will decrease coverage by 4.86%.
The diff coverage is 8.01%.

@@             Coverage Diff              @@
##             master     #136      +/-   ##
============================================
- Coverage     60.35%   55.48%   -4.87%     
- Complexity      550      554       +4     
============================================
  Files           102      112      +10     
  Lines          2048     2251     +203     
  Branches        233      261      +28     
============================================
+ Hits           1236     1249      +13     
- Misses          728      918     +190     
  Partials         84       84              

Impacted Files	Coverage Δ
...mmands/prescription/DeletePrescriptionCommand.java	0.00% <0.00%> (ø)
...ommands/prescription/ListPrescriptionsCommand.java	0.00% <0.00%> (ø)
...ress/logic/parser/AddAppointmentCommandParser.java	66.66% <0.00%> (-1.76%)	⬇️
.../seedu/address/logic/parser/AddressBookParser.java	100.00% <ø> (ø)
...du/address/logic/parser/AppointmentBookParser.java	40.00% <0.00%> (-17.15%)	⬇️
...ser/prescription/AddPrescriptionCommandParser.java	0.00% <0.00%> (ø)
.../prescription/DeletePrescriptionCommandParser.java	0.00% <0.00%> (ø)
...r/prescription/ListPrescriptionsCommandParser.java	0.00% <0.00%> (ø)
...seedu/address/model/prescription/Prescription.java	0.00% <0.00%> (ø)
...ion/exceptions/DuplicatePrescriptionException.java	0.00% <0.00%> (ø)
... and 8 more

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[joshenx]

Lgtm, just need to consider alternative function names for those I highlighted. Thanks for the hard work :)

[joshenx]

lgtm, ty!