Added LED control docs to readme

Author: andrew

Readme.md

@@ -37,6 +37,29 @@ Mac OSX driver: http://tattiebogle.net/index.php/ProjectRoot/Xbox360Controller/O
     xbox.on('right:move', function(position){
       console.log('right:move', position)
     })
+    
+## LEDs
+
+Set LED pattern on controller:
+
+    xbox.setLed(0x0A)
+
+Available LED patterns:
+
+    0x00   All off
+    0x01   All blinking
+    0x02   1 flashes, then on
+    0x03   2 flashes, then on
+    0x04   3 flashes, then on
+    0x05   4 flashes, then on
+    0x06   1 on
+    0x07   2 on
+    0x08   3 on
+    0x09   4 on
+    0x0A   Rotating (e.g. 1-2-4-3)
+    0x0B   Blinking*
+    0x0C   Slow blinking*
+    0x0D   Alternating (e.g. 1+4-2+3), then back to previous*
 
 ## TODO