Initial release with comprehensive CLI support for managing todo.txt tasks.

• Add, list, complete, prioritize, tag, and organize tasks using the topydo CLI.
• Full support for dependencies, due/start dates, recurrence, projects, and custom tags.
• Installation instructions for pip, Homebrew, and apt.
• Detailed usage examples and workflows for common task management scenarios.
• Includes advanced features such as sorting, filtering, grouping, and visualizing dependencies.
• Compatible with macOS, Linux, and Windows (requires Python 3 and pip).