Add remove item functionality, mock data, exception handling to console app:

Description

• Remove item functionality
• MockData (mock list on startup with 3 items)
• Exception handling (what if we input a string instead of a number)

Issue

#42 (closed)

Tophatting

No automated testing.

Additional

• Unit test written
• Meets requirements
• Cross-browser tested
• Added/updated documentation as needed
• Camel case style used