Add comprehensive README with mini rack build guide and specifications

[Copilot]

Repository needed documentation for a home mini rack build with specifications.

Changes

• Overview: Compact mini rack for home lab/homeserver setup
• Build Guide:
  • Planning considerations (space, power, cooling, cables)
  • Materials list (rack components, PDU, tools)
  • 5-step assembly process (rack prep, power distribution, equipment mounting, cable management, final setup)
• Specifications:
  • Physical: 9U rack, 19" width, 450mm depth, 50kg capacity
  • Equipment: Router/firewall, 24-port switch, 2U server (32GB ECC RAM), NAS, UPS (1000VA), PDU
  • Power: 150W idle, 300W typical, 600W max
  • Network: 1Gbps internal, VLAN segmentation
• Additional sections: Use cases, maintenance schedule, cost breakdown ($1,550-3,900), safety guidelines, resources

Expanded from minimal 2-line description to 206-line comprehensive documentation.

Original prompt

It will be just readme with info how I build my mini rack and specification.

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