Expand README.md with comprehensive feature documentation

[Copilot]

This PR significantly enhances the README.md documentation to provide comprehensive coverage of all Winix features, addressing the need for better documentation of the project's capabilities.

Changes Made

Expanded Key Features Section

Enhanced the existing Key Features section with three new subsections:

• Advanced Git Integration: Documents native Git command execution, interactive mode, real-time repository status, and TUI Git panels
• Modern TUI Interface: Details the multi-tab dashboard, real-time monitoring, and interactive command execution capabilities
• Comprehensive Command Suite: Updated to include all available commands including Git integration and system monitoring tools

New Feature Documentation Section

Added a comprehensive new section with detailed tables and documentation:

Command Reference Table

Documents all 13 supported commands with usage examples:

• Core Unix commands: chmod, chown, uname, ps
• System monitoring: sensors, free, uptime, df
• Directory navigation: cd, pwd, ls
• Version control: git
• Utility: help

Git Integration Features

Detailed table covering 7 key Git features:

• Command execution through Winix
• Interactive Git mode (git --interactive)
• Automatic repository detection
• Branch information display
• Real-time status monitoring in TUI
• Commit history viewing
• Repository information display

TUI Interface Features

Comprehensive documentation of the Terminal User Interface:

• Dashboard Tabs: 7 tabs (System, Processes, Memory, Disks, Sensors, Files, Git) with detailed feature descriptions
• Interactive Features: Navigation, command mode, help system, real-time updates
• Git TUI Panels: Repository information, branch status, working tree status, commit history

Screenshots Preserved

Both existing screenshots showcasing the TUI interface are maintained:

System information tab with OS details, uptime, and system monitoring

Git tab showing repository information, branch status, and recent commits

Structure Maintained

• All existing sections preserved (Overview, Installation, Project Structure, Development, Technical Specifications, License)
• Existing content enhanced rather than replaced
• Consistent markdown formatting and table structure
• Professional documentation style maintained

This update transforms the README from a basic feature overview into a comprehensive user guide that clearly documents all of Winix's capabilities, making it easier for users to understand and utilize the full feature set.

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