Added a top level license file

[pmitros]

The course is offered under CC-BY, which is fantastic. This is not obvious from the repository (unless you dig into the iPython notebooks). A top-level license file makes this obvious both to people browsing and to search engines.

[gforsyth]

Hey @pmitros -- yes, this definitely needs to be done. All the code, however, needs to be listed under an MIT license. Do you think we can put both agreements in the same LICENSE.md?

[ahmadia]

@gforsyth - yeah that's fine.

[ahmadia]

The correct thing to do is put the statement from the notebooks at the top, then copy the full licenses below.

[ahmadia]

This is a pretty good starting point: https://github.com/swcarpentry/bc/blob/gh-pages/LICENSE.md

[pmitros]

Rebased. How about this?

I kept this as a plain text file. github defaults to plain text for the LICENSE files, and I followed their convention for maximum compatibility with search engines.

[ahmadia]

Thanks, @gforsyth I'm going to merge this.

[gforsyth]

Needs editing -- still refers to Software Carpentry in the license -- I'll edit it on master

[gforsyth]

also, thanks again @pmitros !

[ahmadia]

@gforsyth - my mistake, I didn't even catch that. I'll fix.

[gforsyth]

@ahmadia I got it already, no worries

[pmitros]

Sorry. My bad.