Create SG250-26.yaml (#3612)

* Create SG250-26.yaml

* Update SG250-26.yaml

---------

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

device-types/Cisco/SG250-26.yaml

@@ -0,0 +1,72 @@
+---
+manufacturer: Cisco
+model: SG250-26
+slug: cisco-sg250-26-k9
+part_number: SG250-26-K9
+u_height: 1
+is_full_depth: false
+weight: 2.72
+airflow: side-to-rear
+weight_unit: kg
+comments: '[SG250 Series Datasheet](https://www.cisco.com/c/en/us/products/collateral/switches/250-series-smart-switches/datasheet-c78-737061.html)'
+console-ports:
+  - name: console
+    type: de-9
+power-ports:
+  - name: External PS
+    type: iec-60320-c14
+    maximum_draw: 19
+    allocated_draw: 18
+interfaces:
+  - name: GigabitEthernet1
+    type: 1000base-t
+  - name: GigabitEthernet2
+    type: 1000base-t
+  - name: GigabitEthernet3
+    type: 1000base-t
+  - name: GigabitEthernet4
+    type: 1000base-t
+  - name: GigabitEthernet5
+    type: 1000base-t
+  - name: GigabitEthernet6
+    type: 1000base-t
+  - name: GigabitEthernet7
+    type: 1000base-t
+  - name: GigabitEthernet8
+    type: 1000base-t
+  - name: GigabitEthernet9
+    type: 1000base-t
+  - name: GigabitEthernet10
+    type: 1000base-t
+  - name: GigabitEthernet11
+    type: 1000base-t
+  - name: GigabitEthernet12
+    type: 1000base-t
+  - name: GigabitEthernet13
+    type: 1000base-t
+  - name: GigabitEthernet14
+    type: 1000base-t
+  - name: GigabitEthernet15
+    type: 1000base-t
+  - name: GigabitEthernet16
+    type: 1000base-t
+  - name: GigabitEthernet17
+    type: 1000base-t
+  - name: GigabitEthernet18
+    type: 1000base-t
+  - name: GigabitEthernet19
+    type: 1000base-t
+  - name: GigabitEthernet20
+    type: 1000base-t
+  - name: GigabitEthernet21
+    type: 1000base-t
+  - name: GigabitEthernet22
+    type: 1000base-t
+  - name: GigabitEthernet23
+    type: 1000base-t
+  - name: GigabitEthernet24
+    type: 1000base-t
+  - name: GigabitEthernet25
+    type: 1000base-x-sfp
+  - name: GigabitEthernet26
+    type: 1000base-x-sfp