Revert the canvas size to the one from the chapter

README.md

@@ -4,3 +4,24 @@ DoRayMe
 =======
 
 A Quick and dirty raytracer.
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+This raytracer is made following the book "[The Ray Tracer Challenge](https://pragprog.com/book/jbtracer/the-ray-tracer-challenge)" by Jamis Buck.
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+It is writen in C++ with no STL and use [LodePNG](https://github.com/lvandeve/lodepng) to output PNG file.
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+Examples outputs
+----------------
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+From chapter 05:
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+![Chapter 5 rendering test](output/ch05_test.png)
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+From Chapter 06:
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+![Chapter 6 rendering test](output/ch06_test.png)
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+From Chapter 07:
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+![Chapter 7 rendering test](output/ch07_test.png)