add flight planning animation

source/using.rst

@@ -132,6 +132,10 @@ From James and Robson (2014), `CC BY 4.0 <https://creativecommons.org/licenses/b
 
 As this approach to flying can be take longer than typical flights, a pilot or team can fly a small area using the above approach. OpenDroneMap will generate a calibration file called cameras.json that then can be imported to be used to calibrate another flight that is more efficiently but, from a self calibration perspective, less accurately.
 
+.. figure:: images/flightplanning.gif
+   :alt: animation showing optimum
+   :align: center
+
 Vertically separated flight lines also improve accuracy, but less so than a camera that is forward facing by 5°.
 
 .. figure:: images/forward_facing.png