Add native Windows CLI with PyInstaller build system

[danielshue]

Native Windows CLI Implementation

This PR adds a complete Windows CLI solution with PyInstaller build automation.

Features Added:

• Standalone Windows executable (~47.5MB, no Python required)
• Automated build system with PyInstaller
• Professional CLI interface with enhanced help
• Complete documentation with usage examples
• User-friendly installation with PATH management

Files Added/Modified:

• coursera_cli.py - User-friendly CLI entry point for Windows executable
• build_windows_cli.py - Automated PyInstaller build script
• README_CLI.md - Complete CLI documentation and usage guide
• coursera_workflow.py - Renamed from workflow.py for clarity
• coursera_dl.py - Added robust import handling
• .gitignore - Exclude auto-generated build artifacts

Testing:

• ✅ CLI functionality verified
• ✅ Windows executable builds successfully
• ✅ All imports and dependencies working
• ✅ Documentation complete and accurate

Usage:

# Build the Windows executable
python build_windows_cli.py

# Run the executable
dist/coursera_downloader.exe --help

[Dattebayooooo]

Hey, does cli works for you using cookies & creds ?

Can you please add standalone app for Mac

Script for mac
pyinstaller --onefile --windowed --name "Coursera Downloader for Mac" --icon icon/icon.png maingui.py