Add comprehensive Windows installation and build tools

- install_and_run.bat: One-click installer that handles dependencies and starts app
- build_windows_exe.bat: Automated executable builder for Windows
- run_datecs_monitor.bat: Smart launcher for both exe and Python versions
- Updated README with Quick Start section and new installation options
- Complete solution for Windows users without Python knowledge

Initial commit: Datecs Cash Register Monitor v1.0.0

- Windows system tray application for Datecs cash register monitoring
- Real-time connection status with visual indicators
- Configurable settings with GUI
- Windows startup integration
- Compatible with Datecs FP-2000, FP-700, WP-500, DP series