Merge pull request #74 from arduino/benjamindannegard/cat-m1-shield-link-fix

benjamindannegard/ Added cat m1 store link

Author: BenjaminDannegard

content/hardware/04.pro/shields/portenta-cat-m1-nb-iot-gnss-shield/tutorials/getting-started/getting-started.md

@@ -37,7 +37,7 @@ The goals of this project are:
 
 - Arduino IDE ([online](https://create.arduino.cc/) or [offline](https://www.arduino.cc/en/main/software)).
 - [Portenta H7](https://store.arduino.cc/products/portenta-h7)
-- [Portenta Cat. M1/NB IoT GNSS Shield]()
+- [Portenta Cat. M1/NB IoT GNSS Shield](https://store.arduino.cc/products/portenta-catm1)
 - [Dipole Antenna](https://store.arduino.cc/antenna) (or equivalent product with the same frequency range).
 
 ## Instructions