move the Cursor with WASD
move the Cursor in steps with the arrow keys
press 0-9 to Place a Cell
press n to go to the next Step of the Simulation
press the Spacebar to start the Simulation

The Rule of the cellular Automata:
each tile has a value between 0 and 9
in each iteration the sum of a tile
and its neighbours gets calculated
if the sum is between 10 and 20,
the new value for that Tile ist sum%10