Update README.md

README.md

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 A falling sand simulation game.
 
 Play at [Sandboxels.R74n.com](https://sandboxels.r74n.com/).
+
+# Controls
+[Sandboxels Controls]
+ * Left Click      =  Place Pixels
+ * Right Click     =  Erase Pixels
+ * Middle Click    =  Pick Element
+ * Spacebar or P   =  Pause Simulation
+ * Shift + Heat    =  Intense Heating
+ * Shift + Cool    =  Intense Cooling
+ * - or [          =  Decrease Cursor Size
+ * + or ]          =  Increase Cursor Size
+ * Shift + -       =  Set Cursor Size to 1
+ * Shift + +       =  Increase Cursor Size
+ * E               =  Element Selection
+ * >               =  Step
+
+(Alt/Option can be used in place of Shift)
+
+# Button Info
+ * Pause           =  Pause/play the simulation
+ * Step            =  Run a single frame
+ * Up Arrow        =  Increase the cursor size
+ * Down Arrow      =  Increase the cursor size
+ * Reset           =  Clears the entire simulation
+ * Replace         =  Overrides pixels when placing
+ * E               =  Select any element by name
+ * TPS             =  Change how fast the simulation runs
+ * Hide            =  Run the simulation without updating the display