Add and update Java Docs

[HmuuMyatMoe]

No description provided.

[codecov]

Codecov Report

Patch coverage: 33.33% and project coverage change: -0.06 ⚠️

Comparison is base (a5e1114) 70.94% compared to head (331a294) 70.89%.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #295      +/-   ##
============================================
- Coverage     70.94%   70.89%   -0.06%     
  Complexity     1004     1004              
============================================
  Files           170      170              
  Lines          3098     3099       +1     
  Branches        391      391              
============================================
- Hits           2198     2197       -1     
- Misses          827      829       +2     
  Partials         73       73              

Impacted Files	Coverage Δ
src/main/java/trackr/logic/LogicManager.java	85.71% <ø> (-0.50%)	⬇️
...ain/java/trackr/logic/commands/AddItemCommand.java	92.30% <ø> (ø)
...n/java/trackr/logic/commands/ClearItemCommand.java	100.00% <ø> (ø)
src/main/java/trackr/logic/commands/Command.java	100.00% <ø> (ø)
.../java/trackr/logic/commands/DeleteItemCommand.java	100.00% <ø> (ø)
...in/java/trackr/logic/commands/EditItemCommand.java	94.87% <ø> (ø)
...c/main/java/trackr/logic/commands/ExitCommand.java	100.00% <ø> (ø)
...in/java/trackr/logic/commands/FindItemCommand.java	100.00% <ø> (ø)
...c/main/java/trackr/logic/commands/HelpCommand.java	100.00% <ø> (ø)
...in/java/trackr/logic/commands/ListItemCommand.java	100.00% <ø> (ø)
... and 82 more

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[ChangGittyHub]

LGTM.