readme: Mention Chromodynamics theme

Author: Yury Selivanov

README.md

@@ -12,6 +12,9 @@ from scratch for robustness with an extensive test suite.
 
 ![](https://magicstack.github.io/MagicPython/example.png)
 
+(Color theme used in the screenshot is
+[Chromodymics](https://github.com/MagicStack/Chromodynamics-Theme))
+
 
 ## Installation Instructions