Create zyxel-gs1900-16.yaml (#2793)

* Create zyxel-gs1900-16.yaml

* Update GS1900-16.yaml

added airflow

---------

Co-authored-by: Harry <Harry@cadby.co.uk>

device-types/Zyxel/GS1900-16.yaml

@@ -0,0 +1,49 @@
+---
+manufacturer: Zyxel
+model: GS1900-16
+slug: zyxel-gs1900-16
+part_number: GS1900-16
+u_height: 1
+is_full_depth: false
+comments: '[Zyxel GS1900-16 16-port GbE Smart Managed Switch with GbE Uplink](https://www.zyxelguard.com/GS1900-16.asp)'
+weight: 0.97
+weight_unit: kg
+airflow: passive
+power-ports:
+  - name: PS
+    type: iec-60320-c14
+    maximum_draw: 11
+    description: 100 to 240 V AC, 50/60 Hz
+interfaces:
+  - name: '1'
+    type: 1000base-t
+  - name: '2'
+    type: 1000base-t
+  - name: '3'
+    type: 1000base-t
+  - name: '4'
+    type: 1000base-t
+  - name: '5'
+    type: 1000base-t
+  - name: '6'
+    type: 1000base-t
+  - name: '7'
+    type: 1000base-t
+  - name: '8'
+    type: 1000base-t
+  - name: '9'
+    type: 1000base-t
+  - name: '10'
+    type: 1000base-t
+  - name: '11'
+    type: 1000base-t
+  - name: '12'
+    type: 1000base-t
+  - name: '13'
+    type: 1000base-t
+  - name: '14'
+    type: 1000base-t
+  - name: '15'
+    type: 1000base-t
+  - name: '16'
+    type: 1000base-t