Automated Code Documentation Generator

Write a Python script that uses natural language processing to automatically generate documentation for open-source codebases. The script should be able to take in a codebase, identify the classes, methods, and functions, and then generate clear and concise documentation for each component. The script should also include examples of how to use each function, as well as any relevant parameters or return values. The generated documentation should be in markdown format and should be suitable for use in documentation websites such as readthedocs. Assume that the codebase is stored on a local file system and that the script has permission to read the files. Please make sure that the script is able to handle large codebases and that it is able to generate documentation in a reasonable amount of time. The script should also be able to handle different programming languages, including but not limited to Python, Java, and C++. The script should be able to generate documentation for both public and private functions. Please make sure that the script is well-structured and follows best practices for code quality and documentation.