Add server room components

docs/server-room.md

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+US based, it must be adapted to other countries (in order to avoid voltage problems).
+
+- UPS ([APC Smart-UPS Li-Ion, Short Depth 1000VA](https://www.apc.com/shop/us/en/products/APC-Smart-UPS-Li-Ion-Short-Depth-1000VA-120V-with-SmartConnect-Not-for-sale-in-Vermont-/P-SMTL1000RM2UC)) ≈ \$1,400.00
+- Router/Firewall ([Netgate XG-7100 1U](https://www.netgate.com/solutions/pfsense/xg-7100-1u.html)) ≈ \$1,000.00
+- Switch ([TP-Link 48-Port Gigabit Switch TL-SG1048](https://www.amazon.com/dp/B004UBUJZG)) ≈ \$220.00
+  - Quantity : round(_number of students_ / 48 + 1)
+- Server ([Dell EMC PowerEdge R6515](https://www.dell.com/en-us/work/shop/servers-storage-and-networking/poweredge-r6515-rack-server/spd/poweredge-r6515/pe_r6515_13732_vi_vp)) ≈ \$4,000.00
+  - Chassis with up to 8x2.5" Drives
+  - Trusted Platform Module 2.0
+  - AMD EPYC 7302P 3GHz, 16C/32T, 128M Cache (155W) DDR4-3200
+  - 2x 32GB RDIMM, 3200MT/s, Dual Rank
+  - PERC H330 RAID Controller, Minicard
+  - 2x 480GB SSD SATA Mix Use 6Gbps 512 2.5in Hot-plug AG Drive, 3 DWPD, 2628 TBW
+  - Dual, Hot Plug, Redundant Power Supply (1+1), 550W
+  - No PCIe Riser
+  - No Quick Sync
+  - ProSupport and Next Business Day Onsite Service, 60 Month(s)
+- etc
+  - Rack Enclosure ≈ \$500.00
+  - PDU
+  - Cable Manager
+  - Cable Organizer
+  - Cable Pass-Through Panel
+  - Roof Fan Tray