Add task list command

[jeffsieu]

Adds task list with task filtering parameters.

Command syntax

task list [undone/] [done/] [tag/TAG]

[codecov-commenter]

Codecov Report

Merging #75 (64fe761) into master (b250c49) will increase coverage by 1.15%.
The diff coverage is 83.33%.

@@             Coverage Diff              @@
##             master      #75      +/-   ##
============================================
+ Coverage     63.03%   64.18%   +1.15%     
- Complexity      480      493      +13     
============================================
  Files            95       97       +2     
  Lines          1788     1812      +24     
  Branches        191      194       +3     
============================================
+ Hits           1127     1163      +36     
+ Misses          608      590      -18     
- Partials         53       59       +6     

Impacted Files	Coverage Δ
.../seedu/address/logic/parser/TaskCommandParser.java	0.00% <0.00%> (ø)
...u/address/logic/commands/task/ListTaskCommand.java	66.66% <66.66%> (ø)
...ain/java/seedu/address/logic/parser/CliSyntax.java	90.90% <100.00%> (+2.02%)	⬆️
...dress/logic/parser/task/ListTaskCommandParser.java	100.00% <100.00%> (ø)
...rc/main/java/seedu/address/model/ModelManager.java	81.81% <100.00%> (+11.44%)	⬆️
src/main/java/seedu/address/model/task/Task.java	75.00% <0.00%> (ø)
.../seedu/address/model/task/filters/TaskFilters.java	65.00% <0.00%> (+20.00%)	⬆️

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[yeppog]

looks good