Add comprehensive README.md for geoscripting-memes repository

[Copilot]

This PR adds a comprehensive README.md file to document the geoscripting-memes repository, which hosts an interactive web-based slideshow featuring programming and geoscripting-themed memes.

What's included

The README provides complete documentation covering:

🎯 Project Overview

• Clear description of the meme slideshow application
• Feature highlights with organized emoji sections
• List of all 10 meme categories (AI, Bash, Friday, General, Git, Licenses, Monday, Project&Assignment, Python, R)

🚀 Usage Instructions

• Multiple setup options (GitHub Pages deployment + local development)
• Step-by-step usage guide for the slideshow interface
• Media controls explanation (play/pause, navigation, timing, folder selection)

🤝 Contribution Guidelines

• Detailed instructions for adding new memes
• File format requirements and organization guidelines
• Explanation of the automated GitHub Actions workflow

🛠️ Technical Documentation

• Complete project structure breakdown
• Technology stack overview (HTML5, CSS3, JavaScript, Python, GitHub Actions)
• Development setup instructions
• Explanation of the generate_memes_json.py script and automated workflows

Screenshot

The slideshow interface shows a Friday-themed meme with media controls at the bottom, demonstrating the clean, responsive design and intuitive user interface.

Technical verification

• ✅ Tested slideshow functionality locally
• ✅ Verified folder selection dialog works with all 10 categories
• ✅ Confirmed Python script generates memes.json correctly
• ✅ Validated GitHub Actions workflow documentation
• ✅ Ensured all features described in README work as expected

This README transforms the repository from undocumented code into a well-documented, contributor-friendly project that clearly explains its purpose, usage, and contribution process.

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