Add PowerEdge_R840.yml (#1315)

* Create PowerEdge_R840.yml

Reference : https://i.dell.com/sites/csdocuments/Product_Docs/en/dell-emc-poweredge-r840-spec-sheet.pdf

* Update PowerEdge_R840.yml

* Update and rename PowerEdge_R840.yml to PowerEdge-R840.yml

* Update PowerEdge-R840.yml

---------

Co-authored-by: Daniel W. Anner <daniel.anner@danstechsupport.com>

device-types/Dell/PowerEdge-R840.yml

@@ -0,0 +1,30 @@
+---
+manufacturer: Dell
+model: PowerEdge R840
+slug: dell-poweredge-r840
+u_height: 2
+is_full_depth: true
+weight: 36.6
+weight_unit: kg
+comments: |
+  [https://i.dell.com/sites/csdocuments/Product_Docs/en/dell-emc-poweredge-r840-spec-sheet.pdf)
+console-ports:
+  - name: Serial
+    type: de-9
+module-bays:
+  - name: PSU1
+    position: '1'
+  - name: PSU2
+    position: '2'
+interfaces:
+  - name: Gig-E 1
+    type: 1000base-t
+  - name: Gig-E 2
+    type: 1000base-t
+  - name: Gig-E 3
+    type: 1000base-t
+  - name: Gig-E 4
+    type: 1000base-t
+  - name: iDRAC
+    type: 1000base-t
+    mgmt_only: true