Added outlines of methods to insert/retrieve
Added fields and interface methods
Added insert() method
Added size field to measure queue size
Changed field "head" to "last".
This points to the back of the queue, not the front/head
Added retrieve() method.
Added "name" field.
Added code to check if people are added correctly.
Various variable name + syntax corrections
Corrected retrieve and insert methods.
These were set to private incorrectly.
Added outline of getSize() method
Added details of getSize() method.
Included size incr/decrement when people are added/removed from the queue
Changed Supermarket to be type PersonQueue