Add content to README

Author: hollasch

README.md

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-# raytracingtherestofyourlife
+Ray Tracing: The Rest Of Your Life
+====================================================================================================
+
+![Ray Tracing: The Rest Of Your Life](./RTRestOfYourLife.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] and [Ray Tracing: the Next Week], you built a “real” ray tracer.
+
+In this volume, I assume you will be pursuing a career related to ray tracing and we will dive
+into the math of creating a very serious ray tracer. When you are done you should be ready to
+start messing with the many serious commercial ray tracers underlying the movie and product
+design industries. There are many many things I do not cover in this short volume; I dive into
+only one of many ways to write a Monte Carlo rendering program. I don’t do shadow rays
+(instead I make rays more likely to go toward lights), bidirectional methods, Metropolis
+methods, or photon mapping. What I do is speak in the language of the field that studies
+those methods. I think of this book as a deep exposure that can be your first of many, and it
+will equip you with some of the concepts, math, and terms you will need to study the others.
+
+As before, www.in1weekend.com will have further readings and references.
+
+Acknowledgements
+-----------------
+Thanks to Dave Hart and Jean Buckley for help on the original manuscript. Thanks to Paul Melis,
+Nakata Daisuke, Filipe Scur, Vahan Sosoyan, and Matthew Heimlich for finding errors.
+
+
+
+[Amazon.com]:                 https://amazon.com/dp/B01DN58P8C
+[Hack the Hood]:              http://www.hackthehood.org
+[Ray Tracing In One Weekend]: https://github.com/petershirley/raytracinginoneweekend
+[Ray Tracing: The Next Week]: https://github.com/petershirley/raytracingthenextweek
+[Real-Time Rendering]:        http://www.realtimerendering.com/#books-small-table