Add GUI Color Coding

[nihalramesh]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 30.76923% with 18 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...rc/main/java/seedu/address/ui/PersonListPanel.java	0.00%	10 Missing ⚠️
src/main/java/seedu/address/ui/PersonCard.java	0.00%	8 Missing ⚠️

Files with missing lines	Coverage Δ	Complexity Δ
.../main/java/seedu/address/model/person/Student.java	79.54% <100.00%> (+1.49%)	12.00 <2.00> (+1.00)
.../main/java/seedu/address/model/person/Teacher.java	82.22% <100.00%> (+1.26%)	16.00 <2.00> (+1.00)
src/main/java/seedu/address/ui/PersonCard.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...rc/main/java/seedu/address/ui/PersonListPanel.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)

[nihalramesh]

Fixes #66

[maahir-garg]

LGTM