React simon

Simon game implemented in react.

Potential improvements

Add sound
Add gameover sound
Add highscore and score
Make it look prettier (:
Allow for multiple at once (possible via keyboard shortcuts).
Figure out a good UX for telling the user they can use shortcuts to control it... If they click settings it is obvious but if they don't, they might never know.
Potentially make the keyboard shortcuts section collapsed by default to save space and make mobile users less confused.