Add sample recipe and README documentation

[ddvlamin]

Objective

Create a sample recipe file for testing and write project README with API docs.

Details

• Create sample_recipe.md as a valid markdown file with frontmatter and ingredients (e.g., Parmesan Chicken).
• Modify README.md to document the project, its tech stack, setup, endpoints, OpenAPI interactive docs, and recipe parsing format.

Checklist

• Create sample_recipe.md with YAML frontmatter and ingredients
• Add project description, quick start, and available endpoints table to README.md
• Ensure README contains all endpoints with descriptions
• Verify quick start instructions work from fresh clone

Dependencies

None

Notes

A pull request (#11) has been opened to implement these changes.