added initial arguments bits

I added some initial argument bits. Not sure if I got this entirely correct however.

Am happy to contribute more, and appreciate the ideas/tips/thinking about how other projects handle arguments. Let me know if this needs fixing and I'm happy to revise. I think with a bit more direction, I can possibly add checks for supplied arguments to skip prompting and such as well.

I'm in perpectual JS intermediate limbo, so please bear with me. :)