Change "clear" to "reset" and add new commands

[florenciamartina]

Fixes #79

[codecov-io]

Codecov Report

Merging #90 into master will decrease coverage by 0.36%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master      #90      +/-   ##
============================================
- Coverage     73.98%   73.62%   -0.37%     
- Complexity      461      525      +64     
============================================
  Files            77       87      +10     
  Lines          1357     1596     +239     
  Branches        145      180      +35     
============================================
+ Hits           1004     1175     +171     
- Misses          312      368      +56     
- Partials         41       53      +12     

Impacted Files	Coverage Δ	Complexity Δ
.../seedu/address/logic/parser/AddressBookParser.java	80.00% <0.00%> (-20.00%)	12.00% <0.00%> (ø%)
src/main/java/seedu/address/model/AddressBook.java	75.60% <0.00%> (-16.06%)	16.00% <0.00%> (+4.00%)	⬇️
...rc/main/java/seedu/address/model/ModelManager.java	91.37% <0.00%> (-8.63%)	26.00% <0.00%> (+3.00%)	⬇️
...rc/main/java/seedu/address/logic/LogicManager.java	71.42% <0.00%> (-3.58%)	3.00% <0.00%> (ø%)
src/main/java/seedu/address/model/Model.java	100.00% <0.00%> (ø)	1.00% <0.00%> (ø%)
src/main/java/seedu/address/ui/MainWindow.java	0.00% <0.00%> (ø)	0.00% <0.00%> (ø%)
src/main/java/seedu/address/ui/PersonCard.java	0.00% <0.00%> (ø)	0.00% <0.00%> (ø%)
...c/main/java/seedu/address/model/person/Person.java	100.00% <0.00%> (ø)	25.00% <0.00%> (+1.00%)
.../java/seedu/address/storage/JsonAdaptedPerson.java	100.00% <0.00%> (ø)	14.00% <0.00%> (+1.00%)
...a/seedu/address/logic/parser/AddCommandParser.java	100.00% <0.00%> (ø)	5.00% <0.00%> (ø%)
... and 22 more

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[jzwoo]

Hmm for this part is it better to say "Assigns the contact/instructor at the specified index to the module code"? 🤔

[florenciamartina]

I have made some changes. Can you check it again? thanks.

[erinmayg]

LGTM!