Add functionality for searching for orders by their descriptions

[tigerting98]

No description provided.

[codecov-io]

Codecov Report

Merging #65 into master will decrease coverage by 0.84%.
The diff coverage is 0.00%.

@@             Coverage Diff              @@
##             master      #65      +/-   ##
============================================
- Coverage     57.52%   56.67%   -0.85%     
  Complexity      405      405              
============================================
  Files            86       89       +3     
  Lines          1601     1625      +24     
  Branches        166      169       +3     
============================================
  Hits            921      921              
- Misses          635      659      +24     
  Partials         45       45              

Impacted Files	Coverage Δ	Complexity Δ
...main/java/seedu/address/commons/core/Messages.java	0.00% <ø> (ø)	0.00 <0.00> (ø)
...seedu/address/logic/commands/FindOrderCommand.java	0.00% <0.00%> (ø)	0.00 <0.00> (?)
...ava/seedu/address/logic/commands/OrderCommand.java	0.00% <ø> (ø)	0.00 <0.00> (ø)
.../seedu/address/logic/parser/AddressBookParser.java	69.56% <0.00%> (-3.17%)	12.00 <0.00> (ø)
...u/address/logic/parser/FindOrderCommandParser.java	0.00% <0.00%> (ø)	0.00 <0.00> (?)
...l/person/DescriptionContainsKeywordsPredicate.java	0.00% <0.00%> (ø)	0.00 <0.00> (?)

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