Add content to README.md

Author: hollasch

README.md

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-# raytracingthenextweek
+Ray Tracing: The Next Week
+====================================================================================================
+
+![Ray Tracing: The Next Week](./RTNextWeek.jpg)
+
+Getting the Book
+-----------------
+You can download the PDF version of the book from Eric Haine's [Real-Time Rendering] site.
+Alternatively, you can purchase a Kindle version of this series from [Amazon.com]. Half of the
+proceeds of these sales go to [Hack the Hood], a really neat organization.
+
+Overview
+---------
+In [Ray Tracing In One Weekend], you built a simple brute force path tracer. In this installment
+we’ll add textures, volumes (like fog), rectangles, instances, lights, and support for lots of
+objects using a BVH. When done, you’ll have a “real” ray tracer.
+
+A heuristic in ray tracing that many people—including me—believe, is that most optimizations
+complicate the code without delivering much speedup. What I will do in this mini-book is go with the
+simplest approach in each design decision I make. Check www.in1weekend.com for readings and
+references to a more sophisticated approach. However, I strongly encourage you to do no premature
+optimization; if it doesn’t show up high in the execution time profile, it doesn’t need optimization
+until all the features are supported!
+
+The two hardest parts of this book are the BVH and the Perlin textures. This is why the title
+suggests you take a week rather than a weekend for this endeavor. But you can save those for last if
+you want a weekend project. Order is not very important for the concepts presented in this book, and
+without BVH and Perlin texture you will still get a Cornell Box!
+
+Acknowledgments
+----------------
+Thanks to Becker for his many helpful comments on the draft and to Matthew Heimlich for spotting a
+critical motion blur error. Thanks to Andrew Kensler, Thiago Ize, and Ingo Wald for advice on
+ray-AABB tests. Thanks to David Hart and Grue Debry for help with a bunch of the details. Thanks to
+Jean Buckley for editing.
+
+
+
+[Amazon.com]:                 https://amazon.com/dp/B01CO7PQ8C
+[Hack the Hood]:              http://www.hackthehood.org
+[Ray Tracing In One Weekend]: https://github.com/petershirley/raytracinginoneweekend/
+[Real-Time Rendering]:        http://www.realtimerendering.com/#books-small-table