Update README.md

Author: StrangeGirlMurph

08-Ecosystems/README.md

@@ -6,5 +6,6 @@ Usage:
 - [leftclick] camera movement
 - [rightclick] camera zoom
 - [arrow up/down] move center up and down
+- [arrow left/right] rotate 90 deg left/right
 - [d] default view
-- [t] top down view
+- [t] top down view