Added files via upload

[abuchele]

This is my completed pickling toolbox exercise!

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This change is

[jenwei]

Reviewed 1 of 1 files at r1.
Review status: all files reviewed at latest revision, 2 unresolved discussions.

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counter.py, line 34 [r1] (raw file):
This works but can be condensed to just if ifexists: - same applies to other boolean statements

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counter.py, line 44 [r1] (raw file):
This works, but it'd be great to add an else as good coding practice and to improve readability

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Comments from Reviewable