Enhance add and edit command

[YangJiyu98]

No description provided.

[codecov-io]

Codecov Report

Merging #233 (43c8bcf) into master (3db5f46) will increase coverage by 0.15%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master     #233      +/-   ##
============================================
+ Coverage     68.83%   68.98%   +0.15%     
- Complexity      558      575      +17     
============================================
  Files            92       92              
  Lines          1893     1938      +45     
  Branches        208      212       +4     
============================================
+ Hits           1303     1337      +34     
- Misses          515      526      +11     
  Partials         75       75              

Impacted Files	Coverage Δ	Complexity Δ
...java/seedu/forgetfulnus/commons/core/Messages.java	0.00% <ø> (ø)	0.00 <0.00> (ø)
...du/forgetfulnus/logic/parser/AddCommandParser.java	90.24% <100.00%> (+4.03%)	16.00 <4.00> (+8.00)
...du/forgetfulnus/logic/parser/ArgumentMultimap.java	100.00% <100.00%> (ø)	11.00 <4.00> (+4.00)
...u/forgetfulnus/logic/parser/EditCommandParser.java	95.12% <100.00%> (+1.18%)	14.00 <3.00> (+3.00)
...rc/main/java/seedu/forgetfulnus/ui/MainWindow.java	0.00% <0.00%> (ø)	0.00% <0.00%> (ø%)
...java/seedu/forgetfulnus/ui/FlashCardListPanel.java	0.00% <0.00%> (ø)	0.00% <0.00%> (ø%)
.../seedu/forgetfulnus/logic/commands/AddCommand.java	95.00% <0.00%> (ø)	10.00% <0.00%> (ø%)
...seedu/forgetfulnus/logic/commands/QuizCommand.java	84.21% <0.00%> (ø)	5.00% <0.00%> (ø%)
...forgetfulnus/logic/commands/RandomQuizCommand.java	83.78% <0.00%> (ø)	7.00% <0.00%> (ø%)
...seedu/forgetfulnus/logic/commands/NextCommand.java	83.33% <0.00%> (+1.51%)	5.00% <0.00%> (ø%)
... and 2 more

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[tjwjoe]

LGTM