Update UserGuide.md and DeveloperGuide.md

[yeohhq]

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[codecov-io]

Codecov Report

Merging #84 into master will not change coverage.
The diff coverage is 0.00%.

@@            Coverage Diff            @@
##             master      #84   +/-   ##
=========================================
  Coverage     61.26%   61.26%           
  Complexity      566      566           
=========================================
  Files           112      112           
  Lines          2112     2112           
  Branches        250      250           
=========================================
  Hits           1294     1294           
  Misses          719      719           
  Partials         99       99           

Impacted Files	Coverage Δ	Complexity Δ
.../seedu/address/logic/parser/AddressBookParser.java	53.33% <0.00%> (ø)	12.00 <0.00> (ø)
...ointmentparser/AppointmentDeleteCommandParser.java	0.00% <0.00%> (ø)	0.00 <0.00> (?)
...ppointmentparser/AppointmentEditCommandParser.java	0.00% <0.00%> (ø)	0.00 <0.00> (?)
...ppointmentparser/AppointmentListCommandParser.java	0.00% <0.00%> (ø)	0.00 <0.00> (?)
...ntmentparser/AppointmentScheduleCommandParser.java	0.00% <0.00%> (ø)	0.00 <0.00> (?)

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