👃 readme udpate

Author: michalbe

readme.md

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+Rust Raytracer
+--
+by [@michalbe](http://github.com/michalbe), based on a (https://github.com/petershirley/raytracinginoneweekend) book by Peter Shirley.
+
+## Run
+```
+time cargo run --release > result.ppm
+```
+
+## Result
+![result.png](result.png)