Add GUI section to UG and tweak Order's toString()

[youyingfeng]

No description provided.

[codecov-io]

Codecov Report

Merging #166 into master will decrease coverage by 2.49%.
The diff coverage is 4.71%.

@@             Coverage Diff              @@
##             master     #166      +/-   ##
============================================
- Coverage     48.86%   46.37%   -2.50%     
- Complexity      461      470       +9     
============================================
  Files           116      120       +4     
  Lines          2200     2357     +157     
  Branches        243      259      +16     
============================================
+ Hits           1075     1093      +18     
- Misses         1060     1197     +137     
- Partials         65       67       +2     

Impacted Files	Coverage Δ	Complexity Δ
...java/seedu/address/logic/commands/DoneCommand.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...du/address/logic/commands/UpdateClientCommand.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...edu/address/logic/commands/UpdateOrderCommand.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
.../seedu/address/logic/parser/AddressBookParser.java	64.00% <0.00%> (-2.67%)	12.00 <0.00> (ø)
...address/logic/parser/DeleteOrderCommandParser.java	91.66% <ø> (+91.66%)	4.00 <0.00> (+4.00)
...ddress/logic/parser/UpdateClientCommandParser.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...address/logic/parser/UpdateOrderCommandParser.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...rc/main/java/seedu/address/model/ModelManager.java	79.72% <0.00%> (ø)	29.00 <0.00> (ø)
...u/address/model/person/OrderClientIdPredicate.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...n/java/seedu/address/storage/JsonAdaptedOrder.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
... and 28 more

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