Add a helpfile

[benknoble]

This helpfile comprises the following sections:

1. Intro (what is this thing)
2. Usage (it's a colorscheme)
3. Configuration (variables used by dracula)
4. Personal Customization (tips on changing parts of the scheme)
5. License (mention of MIT)
6. Bugs (link to issue tracker)
7. Contributing (link to pull requests)
8. Credits

If any of the wording needs work, don't hesitate to let me know.

The format is fairly standard. The file is best viewed in vim itself (either with modelines enable or by explicitly setting filetype to help).

/cc @dsifford

[dsifford]

LGTM

I'll merge this after #62

On a different note, are you interested in being a maintainer here as well?

Not sure if I'm out of place or not by saying this, but it appears that @heinst and @BlakeWilliams might have moved on to bigger and better things. (If you guys are reading this and this is inaccurate, can you chime back here and let us know what your commitment level is to the project?)

[benknoble]

Actually, it was a PR against your branch dsifford-overhaul since it was related (meaning it would get merged into the commits of #62). I can rebase and target master instead if that's more appropriate.

Considering I'm in vim looking at Dracula 7 days (and nights) of the week, I'm certainly interested. However, if 4 would be crowded, no hard feelings.

[dsifford]

Oh whoops! Just assumed you had this targeting master.

Cool, yeah we can merge this over.

Re: You helping out -- You've got my vote. Thoughts @zenorocha ?