Minor README.md fix

[HamimMahdie]

Update README with Setup Guide

• Purpose:
  Provide setup instructions for running Supermemory locally.
• Key Changes:
  • Updated the "Contribute or self host" section to mention the new SETUP-GUIDE.md file.
  • Corrected a typo in the description ("design" -> "designed").
• Impact:
  This change makes it easier for users to set up and run the Supermemory application locally.

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Original Description

grammar- design --> designed

[kaizen-bot]

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• Code Quality: [██████████████████░░] 90% (Excellent)

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