Implement assign command

[lll-jy]

No description provided.

[codecov-io]

Codecov Report

Merging #87 into master will increase coverage by 4.18%.
The diff coverage is 92.85%.

@@             Coverage Diff              @@
##             master      #87      +/-   ##
============================================
+ Coverage     64.87%   69.06%   +4.18%     
- Complexity      486      522      +36     
============================================
  Files            87       89       +2     
  Lines          1640     1671      +31     
  Branches        182      187       +5     
============================================
+ Hits           1064     1154      +90     
+ Misses          521      460      -61     
- Partials         55       57       +2     

Impacted Files	Coverage Δ	Complexity Δ
...main/java/seedu/address/commons/core/Messages.java	0.00% <ø> (ø)	0.00 <0.00> (ø)
...u/address/logic/commands/catalogue/AddCommand.java	100.00% <ø> (ø)	8.00 <0.00> (?)
...address/logic/commands/catalogue/ClearCommand.java	100.00% <ø> (ø)	2.00 <0.00> (?)
...ddress/logic/commands/catalogue/DeleteCommand.java	100.00% <ø> (ø)	7.00 <0.00> (?)
.../address/logic/commands/catalogue/EditCommand.java	97.33% <ø> (ø)	12.00 <0.00> (?)
.../address/logic/commands/catalogue/FindCommand.java	100.00% <ø> (ø)	6.00 <0.00> (?)
.../address/logic/commands/catalogue/ListCommand.java	100.00% <ø> (ø)	2.00 <0.00> (?)
...address/logic/commands/catalogue/StartCommand.java	100.00% <ø> (ø)	7.00 <0.00> (?)
...edu/address/logic/commands/global/ExitCommand.java	100.00% <ø> (ø)	2.00 <0.00> (?)
...edu/address/logic/commands/global/HelpCommand.java	100.00% <ø> (ø)	2.00 <0.00> (?)
... and 20 more

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[T-Fang]

LGTM