Add milestone attribute for deliverable.

[shadowezz]

• Implemented UI for milestone as a tag

[chrystalquek]

is person card currently using this?

[shadowezz]

wait i dont think so right

[codecov-io]

Codecov Report

Merging #72 into master will increase coverage by 0.25%.
The diff coverage is 20.00%.

@@             Coverage Diff              @@
##             master      #72      +/-   ##
============================================
+ Coverage     47.17%   47.42%   +0.25%     
- Complexity      540      560      +20     
============================================
  Files           137      139       +2     
  Lines          2474     2545      +71     
  Branches        277      286       +9     
============================================
+ Hits           1167     1207      +40     
- Misses         1245     1274      +29     
- Partials         62       64       +2     

Impacted Files	Coverage Δ	Complexity Δ
...address/logic/commands/deliverable/AddCommand.java	0.00% <ø> (ø)	0.00 <0.00> (ø)
...ddress/logic/commands/deliverable/DoneCommand.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...ess/logic/parser/deliverable/AddCommandParser.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...du/address/logic/parser/deliverable/CliSyntax.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...u/address/logic/parser/deliverable/ParserUtil.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
.../java/seedu/address/model/util/SampleDataUtil.java	0.00% <ø> (ø)	0.00 <0.00> (ø)
...ss/storage/deliverable/JsonAdaptedDeliverable.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...rc/main/java/seedu/address/ui/DeliverableCard.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...ess/model/deliverable/deliverable/Deliverable.java	45.09% <25.00%> (-1.57%)	14.00 <1.00> (+1.00)	⬇️
...dress/model/deliverable/deliverable/Milestone.java	60.00% <60.00%> (ø)	3.00 <3.00> (?)
... and 5 more

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