Create u1-12.checkRep.py

# CORRECT SPECIFICATION:
#
# the Queue class provides a fized-size FIFO queue of integers
#
# the constructor takes a single parameter: an integer >0 that
# is the maximum number of elements the queue can hold
#
# empty() returns True iff the queue holds no elements
#
# full() returns True iff the queue cannot hold any more elements
#
# enqueue(i) attempts to put the integer i into the queue; it returns
# True if successful and False if the queue is full
#
# dequeue() removes an integer from the queue and returns it,
# or else returns None if the queue is empty