REC1: Know how to use a version control system

[JasonJWilliamsNY]

Should link to existing git/Github lessons

[orchid00]

As introduction we are linking to github guides, which are short to the point tutorials.
https://github.com/SoftDev4Research/4OSS-lesson/blob/gh-pages/_episodes/01-introduction.md
@JasonJWilliamsNY do you mean we should add to the software carpentry git lesson?