Create README.md

Author: fauder

README.md

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+# ray-tracing-in-one-weekend
+
+A ray tracer I'm implementing as a study, based on the book [Ray Tracing in One Weekend](https://raytracing.github.io/books/RayTracingInOneWeekend.html).
+I'm adding some custom modifications here and there.
+
+## Custom Modifications
+### Fresnel based Rim Lighting
+![](output_fresnel.png)