Enhance README.md for improved clarity and structure

- Reformatted the README to provide a clearer hierarchical structure for the JS Brains modules, improving readability and navigation.
- Added comprehensive documentation sections, including an overview of the modules, their purposes, and key architectural concepts.
- Updated the "Use Cases" section to better illustrate the practical applications of the JS Brains modules in creating AI-driven solutions.
- Included a new "Directory & File Structures" section to guide users in understanding the organization of the codebase.

These changes aim to enhance the documentation's usability and provide a more informative resource for developers.