Add Remarks

[RB9823]

Added the ability to add/view/edit remarks.
Remarks are 'optional' and can go to a maximum of 50 characters.

[codecov]

Codecov Report

Merging #164 (8c75326) into master (a762b3a) will increase coverage by 0.13%.
The diff coverage is 80.35%.

@@             Coverage Diff              @@
##             master     #164      +/-   ##
============================================
+ Coverage     74.30%   74.43%   +0.13%     
- Complexity      489      501      +12     
============================================
  Files            81       83       +2     
  Lines          1537     1588      +51     
  Branches        167      176       +9     
============================================
+ Hits           1142     1182      +40     
- Misses          350      356       +6     
- Partials         45       50       +5     

Files	Coverage Δ
src/main/java/seedu/address/logic/Messages.java	90.47% <100.00%> (+1.00%)	⬆️
.../java/seedu/address/logic/commands/AddCommand.java	100.00% <ø> (ø)
...a/seedu/address/logic/parser/AddCommandParser.java	100.00% <100.00%> (ø)
...ain/java/seedu/address/logic/parser/CliSyntax.java	87.50% <100.00%> (+1.78%)	⬆️
.../seedu/address/logic/parser/EditCommandParser.java	93.93% <100.00%> (+0.60%)	⬆️
.../java/seedu/address/model/util/SampleDataUtil.java	20.00% <ø> (ø)
.../java/seedu/address/storage/JsonAdaptedPerson.java	93.22% <100.00%> (+0.91%)	⬆️
...java/seedu/address/logic/commands/EditCommand.java	96.80% <87.50%> (-0.90%)	⬇️
...main/java/seedu/address/model/booking/Booking.java	78.84% <83.33%> (-0.33%)	⬇️
src/main/java/seedu/address/ui/BookingCard.java	0.00% <0.00%> (ø)
... and 3 more

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[iyioon]

LGTM