added the weight of NIM-16A (netbox-community#2168)

Author: Ido-Don

module-types/Cisco/NIM-16A.yaml

@@ -3,6 +3,8 @@ manufacturer: Cisco
 model: NIM-16A
 part_number: NIM-16A
 comments: '[Cisco 16-Port Asynchronous Serial NIM](https://www.cisco.com/c/en/us/products/collateral/routers/4000-series-integrated-services-routers-isr/datasheet-c78-739968.html)'
+weight: 620
+weight_unit: g
 console-server-ports:
   - name: Async0/{module}/0
     type: rj-45