Update README.md

Author: AJ Robertson

README.md

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 # Mac OS X Setup Guide
 
-This book are my instructions for myself to get Mac OS X up running.
+This book serves as a guide for how I set up my work environment on Macintosh. All instructions covered assume you are setting up OS X Yosemite. Setting up a new Mac takes days to complete and is impossible to remember. The goal of this book is to make that process more efficient.
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+# About the Author
+
+My name is AJ Robertson, I work at [Infinite Red, Inc.](https://infinite.red) as a developer. I spend most of my time building web applications. Right now, the frameworks I leverage include [React](https://facebook.github.io/react/) and [Phoenix](http://www.phoenixframework.org). If you find this book useful, let me now on [Twitter @ajrob27](https://twitter.com/ajrob27) or by email `[email protected]`.
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+# Contributing / Issues
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+If you would like to contribute or find an issue, this book is a repository on [Github](https://github.com/ajrob27/mac-setup). Pull requests and issues are welcome. Also, feel free to reach out to my by email `[email protected]`.