Added kit's store pages

Added store pages from Oplà and Explore Kits

Author: marqdevx

Readme.md

@@ -4,7 +4,10 @@
 
 This library enables the MKR family to use the MKR IoT Carrier
 
-Read more about the [Explore IoT Kit]()
+Read more about the Kits:
+ * [Explore IoT Kit](https://store.arduino.cc/explore-iot-kit) 
+ * [Oplà IoT Kit](https://store.arduino.cc/opla-iot-kit)
+
 
 For more information about this library please visit us at
 http://www.arduino.cc/en/Reference/MKRIoTCarrier