Revert "Removed README since it's no longer needed as placeholder"

This reverts commit 3b38e2984973756d9e91a1d22cd1cbd4d0774957.
Revert "Revert "Removed README since it's no longer needed as placeholder""

This reverts commit f9162afe7e1556d96d437bbd9ce5058fada8c8a9.
Revert "Removed README since it's no longer needed as placeholder"

This reverts commit 76d472a3296b0623039d4eb5a0270c0c78f6fe30.
Revert "Removed README since it's no longer needed as placeholder"

This reverts commit 3b38e2984973756d9e91a1d22cd1cbd4d0774957.
Re-added README since it is necessary. Git won't maintain an empty directory. 
Changed the contents of the README to indicate why it's necessary.
Cleaned up game loop. Switched to using time given to requestAnimationFrame callback.