Add instructions on top of the IoT Bridges examples

Author: giulcioffi

examples/Nicla_IoT_Bridge/Nicla_IoT_Bridge.ino

@@ -1,3 +1,16 @@
+/* 
+ * Upload this sketch to a Host board to use it as an I2C bridge between 
+ * Nicla Sense ME and the Arduino Cloud. 
+ * Nicla Sense ME board needs to run the basic App.ino sketch and to be plugged
+ * as a shield on top of the Host board.
+ * 
+ * Before uploading this sketch to the Host board:
+ * - add your Host device to Arduino Cloud
+ * - setup temperature and seconds Things in Arduino Cloud
+ * - get the THING_ID and copy it in thingProperties.h
+ * - create a Dashboard in Arduino Cloud, like a live chart of the temperature
+*/
+
 #include "thingProperties.h"
 
 #include "Arduino_BHY2Host.h"

examples/Portenta_BLE_Bridge/Portenta_BLE_Bridge.ino

@@ -1,3 +1,15 @@
+/* 
+ * Upload this sketch to Portenta to use it as a BLE bridge between 
+ * Nicla Sense ME and the Arduino Cloud. 
+ * Nicla Sense ME board needs to run the basic App.ino sketch.
+ * 
+ * Before uploading this sketch to Portenta:
+ * - add your Portenta device to Arduino Cloud
+ * - setup temperature and seconds Things in Arduino Cloud
+ * - get the THING_ID and copy it in thingProperties.h
+ * - create a Dashboard in Arduino Cloud, like a live chart of the temperature
+*/
+
 #include <ArduinoIoTCloud.h>
 #include <Arduino_ConnectionHandler.h>
 #include "thingProperties.h"