version-control/git/README.md: Add paragraph pitching Git

Why should you use this tool?

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+[Git][] is a popular distributed version control system.  It is used
+by projects ranging from the [huge][linux] to the [tiny][gist],
+including your very own [Software Carpentry][swc].
+
+On the technical side, it offers [staging areas][staging],
+[revisionist history][rewrite], and a simple [object
+model][internals].
+
+[Git]: http://git-scm.com/
+[linux]: https://www.kernel.org/
+[gist]: https://gist.github.com/
+[swc]: http://software-carpentry.org/about/contributing.html#create
+[staging]: http://git-scm.com/about/staging-area
+[rewrite]: https://www.kernel.org/pub/software/scm/git/docs/user-manual.html#cleaning-up-history
+[internals]: http://git-scm.com/book/en/Git-Internals