Add GB300 Multiplanar README

[Prgolan28]

Summary

• Add a distinct README for the BM.GPU.GB300.4 Multiplanar variant
• Link the new Multiplanar guide from the root README
• Document the rdmaFabricData.planes = 4 validation path and topology-aware smoke checks

Testing

• Verified markdown file placement and root README link
• Ran sensitive-string scan; only expected public image/PAR links matched

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[amgowda-oci]

do not merge, good docs

[Prgolan28]

Oracle Confidential Ack. PR is for testing the skill workflow. To be rejected later. Get Outlook for iOS<https://aka.ms/o0ukef> Oracle Confidential

…

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