Sensors.md

@@ -3,7 +3,9 @@ The `src/shared/sensors/Sensor.h` header file contains the base classes used to
 - `AbstractSensor` is the top-level virtual class.  
 - It is extended by `Sensor`.  
 - A `SensorFIFO` is also provided for driver that use a FIFO (it extends `Sensor`).
-  
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+<div align="center"><img src="images/sensor_manager/sensors_class_diagram.png" height="500"/><br/><i></i></div><br>
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 ## AbstractSensor class
 *  `init()`: this is the first method to be called before using the sensor. It sets up the sensor, e.g. registers.
 *  `selfTest()`: check if the sensor is correctly working.