MOSYNC-3123 Make Doxygen to generate the doc from MoGraph

Make Doxygen to generate the doc from MoGraph

Added MoGraph path in the Doxyfile 
INPUT = . MAUtil/ MAUI/ NativeUI/ new MTXml/ MATest/ MAFS/ MAP/ testify/ Wormhole/ Notification/ Ads/ Facebook/ Purchase/ newlib/MoGraph/