Added dict_sets.py

This is not wrong, but I want to point out that you can combine lines 17-20

    dic_hex = dict(zip([hex(x) for x in range(16)], range(16)))

You certainly don't have to cram it all on one line if you find it less readable that way, but I would suggest at least condensing lines 19 and 20

    dic_hex = dict(zip(a, b))