Show answer after certain commands

[jonfoocy]

Sets visibility of answers to shown after add/edit/find commands.

Closes #127

[codecov-io]

Codecov Report

Merging #136 into master will increase coverage by 0.07%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master     #136      +/-   ##
============================================
+ Coverage     69.28%   69.35%   +0.07%     
- Complexity      446      447       +1     
============================================
  Files            78       78              
  Lines          1377     1377              
  Branches        147      147              
============================================
+ Hits            954      955       +1     
+ Misses          377      376       -1     
  Partials         46       46              

Impacted Files	Coverage Δ	Complexity Δ
...va/seedu/medmoriser/logic/commands/AddCommand.java	85.71% <100.00%> (ø)	8.00 <0.00> (ø)
...a/seedu/medmoriser/logic/commands/EditCommand.java	92.98% <100.00%> (ø)	12.00 <0.00> (ø)
...a/seedu/medmoriser/logic/commands/FindCommand.java	90.47% <100.00%> (ø)	9.00 <0.00> (ø)
...seedu/medmoriser/logic/commands/CommandResult.java	90.90% <0.00%> (+4.54%)	13.00% <0.00%> (+1.00%)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 6c03f9d...d638f5c. Read the comment docs.

[joshruien]

Nice work!

[yongmingyang]

Looks good to go!