Add reading of environmental sensors

environmental_sensors.py

+from sense_hat import SenseHat
+
+sense = SenseHat()
+
+humidity = sense.get_humidity()
+temp_humidity = sense.get_temperature_from_humidity()
+print("Humidity sensor : {:.2f} %rH , {:.2f} °C".format(humidity, temp_humidity))
+
+pressure = sense.get_pressure()
+temp_pressure = sense.get_temperature_from_pressure()
+print("Pressure sensor : {:.2f} Millibars , {:.2f} °C".format(pressure, temp_pressure))