+ requirements

https://pypi.org/project/stanfordkarel/

README.md

@@ -26,4 +26,7 @@ Growth steps: black -> gray -> brown -> purple -> red -> orange -> olive
 
 Steps with reproduction: olive -> blue -> green -> cyan -> pink
 
-Each reproduction step becomes more successful and creates more offspring.
+Each reproduction step becomes more successful and creates more offspring.
+
+## Requirement
+[standfordkarel](https://pypi.org/project/stanfordkarel/)