Delete multiply.py

This file is unneeded.  There is a duplicate, and the other file finds the multiples, which is part of the challenge.
Merge pull request #9 from mylesJG28/patch-1

Delete multiply.py
test file added
test file added
Merge pull request #12 from ams-bjones/master

added tests
Merge pull request #1 from 10A/master

update pull