New documentation

docs/Bind_Timing.md

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+#Getting your Bind timing right. 
+On many consumer models it it important for the Tx to send a bind signal in a narrow window once the model has powered up.  
+
+If the bind signal is not recieved during this window, the bind sequence times out.  Try this:  
+
+ 1. power the transmitter up with the throttle stick high.  This will trigger the warning window on the transmitter and put a hold on the transmitter bind process.  
+ 1. turn on the model
+ 1. while holding the bind button (if in PPM mode), at the right moment bring the throttle down to instantly bring the transmitter into bind mode.  
+
+If you are using Serial Mode it is best to check the Autobind box in the Model Settings menu.  This will automatically initiate a bind sequence as soon as the Tx module powers up (Note: the Tx module only powers up when the transmitter passes the Switch/Throttle Warning page).