Implement native shell scripts for cross-platform text transformations with clipboard integration

[Copilot]

This PR implements a comprehensive collection of native shell scripts for Linux, macOS, and Windows PowerShell that provide Unicode-based text transformations with automatic clipboard functionality.

Features Implemented

Text Transformations

• Rage Flip: Converts text to upside-down Unicode characters (Hello World! → ¡plɹoM ollǝH)
• Word Flip: Reverses word order (Hello World Everyone → Everyone World Hello)
• Underline: Adds Unicode combining underline characters (Hello → H̲e̲l̲l̲o̲)
• sArCaSm: Alternating case transformation (This is so cool → ThIs Is So CoOl)
• Strikethrough: Adds Unicode combining strikethrough (Hello → H̶e̶l̶l̶o̶)

Cross-Platform Support

• Unix/Linux/macOS: Bash scripts with comprehensive clipboard support (pbcopy, xclip, xsel, wl-clipboard)
• Windows: PowerShell scripts with native Set-Clipboard integration
• All scripts automatically detect and use available clipboard utilities

User Experience Enhancements

• Unified Scripts: Single command access to all transformations via text_flip.sh (Unix) and TextFlip.ps1 (Windows)
• Interactive Mode: all command shows all transformations and allows user selection
• Automated Installation: install.sh script handles setup, testing, and clipboard utility detection
• Comprehensive Documentation: Detailed README with installation instructions and usage examples

Usage Examples

# Quick install and setup
git clone https://github.com/stringsn88keys/script_flips.git
cd script_flips
./install.sh

# Individual transformations
./unix/text_flip.sh rage "Hello World!"
./unix/text_flip.sh sarcasm "This is amazing"

# Interactive mode - see all effects and choose
./unix/text_flip.sh all "Your text here"

# Windows PowerShell
.\windows\TextFlip.ps1 rage "Hello World!"
.\windows\TextFlip.ps1 all "Your text here"

Technical Implementation

• Unicode character mapping for rage flip transformation
• Combining Unicode characters (U+0332, U+0336) for underline/strikethrough
• Cross-platform clipboard detection and fallback handling
• Error handling and user-friendly messaging
• Platform-native implementations without external dependencies

The scripts are immediately ready for use and provide a polished experience for text transformation across all major platforms.

Original prompt

Build native shell scripts for Linux, macOS, PowerShell to provide rage flip, unicode word flip, underline, sArCaSm text, strikethrough text, etc using unicode that auto copies to the native clipboard.

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