Add more diverse example YAML files

Description: Create 5+ diverse project examples showing Arkify's versatility across different project types.

Examples needed:

• Mobile app project (React Native, Flutter, Swift)
• API/backend service (Node.js, Django, Rails)
• Chrome extension
• Open source library/package
• Freelance client work
• E-commerce site
• Developer tool/CLI

Todo:

• Create new YAML files in examples/ folder
• Use real or realistic project data
• Include all required fields (name, hours, cost, tech_stack, learning)
• Optionally include extended fields (results, expectations vs reality)
• Test with: python arkify.py examples/your-project.yaml

Good for: First-time contributors, anyone who's built side projects!

Template:

project:
  name: "Your Project Name"
  tagline: "One-line description"
  hours: 42
  cost: 100
  tech_stack:
    - "Tech 1"
    - "Tech 2"
    - "Tech 3"
    - "Tech 4"
  learning: "Your key insight"

See existing examples in examples/ folder for inspiration!