Twofer Exercise

[miken500]

I wanted to try to add a few exercises since I've had a great time doing them. I picked an easy one to learn the process of github and exercism. I have two more after this one. Thanks.

[coriolinus]

Hi @miken500, thanks for contributing this! Unfortunately, @AvasDream has already submitted a PR adding the twofer exercise: #520. You two can communicate directly to decide who should be the primary mover on this; I have no vested interest in the result.

If it comes down to me making a decision between the implementations, assuming both are in passing state, I will give priority to #520 because it was submitted first.

Finally, there's no need to operate serially: if you have multiple new exercises ready for submission, please feel free to submit a PR for each of them simultaneously.

[miken500]

Thanks. I forgot to re-search after starting it a week ago.

I'll submit the other exercises. I wanted to make sure I got the process down for this exercise as practice before attempting more.