[skip ci] Create model_bring_up.md

[bbeggsTT]

Ticket

N/A

Problem description

This document was previously on a private repo but we need it to be external before the private repo becomes public.

What's changed

Moving this document to tt-metal repo. Added feedback from Utku.

Checklist

• All post commit CI passes
• Blackhole Post commit CI passes (if applicable)
• Model regression CI passes (if applicable)
• Device performance regression CI passes (if applicable)
• (For models and ops writers) Full new models tests CI passes (if applicable)
• New/Existing tests provide coverage for changes