Update iot-pnp-service-devguide-node.md

Author: pritamso

includes/iot-pnp-service-devguide-node.md

@@ -9,6 +9,8 @@ ms.date: 11/17/2022
 The following resources are also available:
 
 - [Node.js SDK reference documentation](/javascript/api/azure-iothub)
+- [Service client samples](https://github.com/Azure/azure-iot-hub-node/blob/main/samples/twin.js)
+- [Digital Twins samples](https://github.com/Azure/azure-iot-hub-node/blob/main/samples/get_digital_twin.js)
 
 ## IoT Hub service client examples