Added README.

Author: topfunky

README.md

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+# Git Internals PDF
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+This PDF explains the internal workings of the Git source code control system. [Download the rendered PDF](https://github.com/pluralsight/git-internals-pdf/raw/master/drafts/peepcode-git.pdf).
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+It was originally written by [Scott Chacon](https://github.com/schacon) and published at PeepCode (now a part of Pluralsight).
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+Scott and [Pluralsight](http://pluralsight.com/training) have generously open sourced it under the Creative Commons Attribution-ShareAlike license.
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+[![Pluralsight](http://s.pluralsight.com/mn/img/sh/logo-v2.png)](http://pluralsight.com/training)
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+- [Download the rendered PDF](https://github.com/pluralsight/git-internals-pdf/raw/master/drafts/peepcode-git.pdf)
+- Fork, submit pull requests, etc.
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+LICENSE: Creative Commons [Attribution-ShareAlike](http://creativecommons.org/licenses/by-sa/3.0/).
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+