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* Chapter 1 : special gesture called "focus gestrue"

- click : your palm should be open, fingers pointing up, and face the sensor.

- wave : should consist of at least 5 horizontal movements (left-right or rigth-left)

** output

- Click, Wave, Swipe, Raise hand, 

** status

- Gesture started

- Gesture completed

* Chapter 3 :Skeleton tracking

** calibration

- the user should be facing the sensor with calibration pose.

** output

- The API returns positions and orientations of the skeleton joints.

**Joint transformations defined