Documenting some controls.

docs/Controls.md

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+# Controls
+
+## Arming
+
+When armed the aircraft is ready to fly and any motors attached will spin when throttle is applied.
+
+By default arming and disarming is done using stick positions.  This is disabled when using a switch to arm.
+
+
+## Stick positions
+
+LOW - the channel value for the mapped channel input is around 1000
+CENTER - the channel value for the mapped channel input is around 1500
+HIGH - the channel value for the mapped channel input is around 2000
+
+| Function                      | Throttle | Yaw     | Pitch  | Roll   |
+| ----------------------------- | -------- | ------- | ------ | ------ |
+| ARM                           | LOW      | HIGH    | CENTER | CENTER | 
+| DISARM                        | LOW      | LOW     | CENTER | CENTER |
+| Profile 1                     | LOW      | LOW     | CENTER | LOW    | 
+| Profile 2                     | LOW      | LOW     | HIGH   | CENTER | 
+| Profile 3                     | LOW      | LOW     | CENTER | HIGH   | 
+| Calibrate Gyro                | LOW      | LOW     | LOW    | CENTER |
+| Calibrate Acc                 | HIGH     | LOW     | LOW    | CENTER |
+| Calibrate Mag/Compass         | HIGH     | HIGH    | LOW    | CENTER |
+| Inflight calibration controls | LOW      | LOW     | HIGH   | HIGH   |
+| Trim Acc Left                 | HIGH     | CENTER  | CENTER | LOW    |
+| Trim Acc Right                | HIGH     | CENTER  | CENTER | HIGH   |
+| Trim Acc Forwards             | HIGH     | CENTER  | HIGH   | CENTER |
+| Trim Acc Backwards            | HIGH     | CENTER  | LOW    | CENTER |
+| Save setting                  | LOW      | LOW     | LOW    | HIGH   |
+