Work Done:
Created Lists class for lists
Half written QuantityUpdateTest in ListTesting.java

Problems Faced:
Since the setup method for the tests creates a new JavaFX thread,
running two tests sequentially has problems because we do not know how
to close a JavaFX thread, and only one JavaFX thread can be running at
any one time.

Work to be Done:
Complete test
Write other tests required for this week