Consolidate prompting cookbook into examples/prompting and add comprehensive README

[paytonison]

Summary

• Centralizes all prompting-related notebooks, guides, and assets into a single directory for easier discovery, comparison, and reuse.
• Adds a focused README with quick start, inventory, suggested learning paths, conventions, and contributing guidance.

What Changed

• Moved all prompting notebooks, notes, and assets into examples/prompting/.
• Added examples/prompting/README.md covering:
  • Quick start
  • What’s inside (by category)
  • Suggested learning paths
  • Folder conventions and contribution notes
  • Model availability notes and tips
• Kept content intact; primarily organizational + documentation updates.

Why

• Improves discoverability and navigation for the prompting materials.
• Establishes clear conventions to keep future additions consistent.
• Makes it easier to learn sequentially or jump to specific topics.

Impact

• No runtime/code behavior changes expected.
• External links to prior file locations may break. See follow-ups.

How To Review

• Browse examples/prompting/ to confirm expected files are present.
• Skim the new README for clarity, structure, and completeness.
• Optionally open a few notebooks to ensure assets/relative paths resolve.

Follow-ups

• Update any inbound links in the repo/docs that referenced old paths.
• Optionally standardize filenames to the documented conventions over time.

[Copilot]

Pull Request Overview

This PR consolidates all prompting-related materials into a unified examples/prompting/ directory and adds a comprehensive README to improve navigation and learning. The main goal is to organize scattered prompting resources into a single location with clear documentation.

• Centralizes prompting notebooks, guides, and assets into one directory structure
• Adds a detailed README with quick start guide, content inventory, and learning paths
• Establishes conventions for future contributions and file organization

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