Update README.md

README.md

@@ -3,3 +3,18 @@ A fun project for visualizing influence in the game of Go.
 
 ![screenshot](/screen1.png?raw=true)
 
+Most of the controls are on the left side of the screen. In addition to those, you can press:
+- Right click: undo
+- Left/Right arrow keys: undo/redo
+- O: Open a SGF file
+- Home/End: Go to the start/end of moves.
+- W/B: Place white/black stones.
+- R: Remove stones
+- A: Set alternating stones.
+- Space: Toggle heatmap
+- H: Toggle hiding the stones on the board.
+
+More screenshots:
+![screenshot](/screen2.png?raw=true)
+![screenshot](/screen3.png?raw=true)
+![screenshot](/screen4.png?raw=true)