Enhanced Roman Numeral Converter with GUI, CLI, and Validation Features

[Mordekai66]

This PR enhances the Roman Numeral Converter with several new features:

New Features Added:

• Graphical User Interface (GUI)—Built with Tkinter for user-friendly interactions

• Command-Line Interface (CLI) - Support for both Roman-to-Integer and Integer-to-Roman conversions

• Input Validation—Comprehensive validation for proper Roman numeral format

• Bidirectional Conversion—Convert both Roman numerals to integers and integers to Roman numerals

• Unit Tests—A comprehensive test suite covering all conversion functions and edge cases

• Modular Architecture—Organized code structure with separate modules for converter, validator, and interfaces

Technical Improvements:

• Modular package structure with roman_converter module

• Enhanced error handling with descriptive error messages

• Input validation to prevent invalid conversions

• Multiple entry points (main.py, cli.py, gui.py) for different use cases

• Comprehensive documentation with usage examples

Usage Examples:

CLI usage

python main.py XIV
python main.py 14 --reverse
python main.py XIV --validate

GUI usage

python gui.py

OR

python main --gui

This enhancement maintains backward compatibility while adding significant functionality and improving the user experience across different interaction modes.