adding Qnap TS-439pro II (#3082)

* adding Qnap TS-439proII

* adding Qnap TS-439proII; slug to lowercase

* adding Qnap TS-439proII; add weight and airflow

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Co-authored-by: naos0815 <naos0815+c@mail-0815.de>
Co-authored-by: Harry <Harry@cadby.co.uk>

device-types/QNAP/TS-439proII.yaml

@@ -0,0 +1,20 @@
+---
+manufacturer: QNAP
+model: TS-439 Pro II
+slug: qnap-ts-439-pro-ii
+part_number: TS-439proII
+u_height: 0
+is_full_depth: false
+weight: 4.65
+weight_unit: kg
+airflow: side-to-rear
+comments: '[TS-439proII Series Datasheet](https://www.qnap.com/en/product/ts-439%20pro%20ii/specs/hardware)'
+power-ports:
+  - name: PSU 1
+    type: iec-60320-c14
+    maximum_draw: 33
+interfaces:
+  - name: Ethernet 1
+    type: 1000base-t
+  - name: Ethernet 2
+    type: 1000base-t