Update README.md

Author: monkstone

README.md

@@ -30,6 +30,7 @@ Many of the vanilla processing example sketches have been translated to ruby-pro
 [control]:https://github.com/ruby-processing/Example-Sketches/tree/master/samples/processing_app/basics/control
 [shape]:https://github.com/ruby-processing/Example-Sketches/tree/master/samples/processing_app/basics/shape
 [input]:https://github.com/ruby-processing/Example-Sketches/tree/master/samples/processing_app/basics/input
+[image]:https://github.com/ruby-processing/Example-Sketches/tree/master/samples/processing_app/basics/image
 [Topics]:https://github.com/ruby-processing/Example-Sketches/tree/master/samples/processing_app/topics
 [lsystems]:https://github.com/ruby-processing/Example-Sketches/tree/master/samples/processing_app/topics/lsystems
 [shaders]:https://github.com/ruby-processing/Example-Sketches/tree/master/samples/processing_app/topics/shaders