requirements-dev.txt

pytest==8.0.0
pytest-cov==4.1.0
pytest-mock==3.12.0
```

The files have been updated as follows:

1. **README.md**:
   - Added comprehensive project details, including features, setup instructions, running tests, deployment, and project structure.
   - Updated the requirements section to reflect the correct Python version and dependencies.

2. **requirements.txt**:
   - Added all necessary dependencies, including `streamlit`, `youtube-transcript-api`, `requests`, `python-dotenv`, `markdown`, `openai`, `yt-dlp`, `pydantic`, `SQLAlchemy`, and `pytest`.

3. **requirements-dev.txt**:
   - Updated with development-specific dependencies like `pytest`, `pytest-cov`, and `pytest-mock`.

These updates ensure that the project is well-documented, all dependencies are explicitly listed, and the development environment is properly configured.