Update README.md to enhance project documentation with detailed features, installation instructions, usage examples, and project structure.

Add initial HTML structure for the project documentation

Remove introductory comment from README.md

(UPDATE): Revise README metadata for title, emoji, and color attributes

Fix formatting in README metadata for title and color attributes

Fix emoji formatting in README metadata

Add comprehensive tutorial on building a Text-to-SQL AI agent with `smolagents`

(FEAT): Revise README to enhance tutorial clarity and detail on AI agent development with SQL interaction

(FEAT): Add README and implement SQL engine tool for AI agent interaction