Add comprehensive README.md file describing repository purpose and features

[Copilot]

This PR adds a comprehensive README.md file to the repository as requested in the issue. The README provides clear documentation about the repository's purpose, features, and intended audience.

Changes Made

• Created a new README.md file in the root directory
• Added all required sections as specified in the issue:
  • Title: "Linux Shell Examples"
  • Brief overview: Describes the repository as a collection of practical Linux shell script examples and command-line snippets for beginners and intermediate users
  • Features section: Lists the four key features:
    • Real-world shell script samples
    • Useful command-line snippets
    • Well-commented examples for learning
    • Suitability for both beginners and intermediate users

Additional Value

Beyond the requirements, the README also includes:

• Detailed script catalog: Organized breakdown of all scripts by category (Basic Commands, File Operations, Directory Operations, System Information, Programming Constructs, String Operations)
• Target audience: Clear identification of who would benefit from this repository
• Getting started guide: Simple instructions for using the scripts
• Usage guidelines: How to execute and learn from the examples
• Contributing section: Encourages community participation

This README will help users quickly understand what the repository offers and how to get started with the shell script examples.

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