Way to add new tests of our own to a problem

[GaurangTandon]

Hi, thanks for the wonderful tool! I have a feature request.

Before submitting the problem, I usually do a few sample tests of my own too. Currently, I maintain an input file, so once I've thought and written a test, I won't have to retype it again.

With your setup, I feel I could be more productive in doing so. So, basically, I'll run a command like cf add-test. Then you'll prompt me for the input and the output, and then put them into files inK.txt and ansK.txt (K = integer) inside my working directory. So, that the next time I run cf test, these files will also be checked for correctness.

Thoughts? I don't know much golang but if you need help I'll be more than happy to help out.

[xalanq]

Actually you can create the extra sample files inK.txt and ansK.txt if both files are not exist.
But I'll consider to add it.

[xalanq]

I think the way above is simple enough. I'll add this way in README.