Add RSS/Atom Feed Debugger web application

Created a comprehensive RSS debugging tool with the following features:
- Universal support for RSS and Atom feeds
- Complete feed metadata display
- Last 10 items analysis with all available fields
- Raw XML structure viewer
- CORS proxy integration for cross-domain requests
- Responsive design with gradient UI
- Example feeds for quick testing
- Zero dependencies, pure HTML/CSS/JavaScript

Perfect for GitHub Pages hosting.

README.md

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-# debug-rss
+# RSS/Atom Feed Debugger 🔧
+
+A simple, powerful web-based tool for debugging and analyzing RSS and Atom feeds. Your RSS Army Knife!
+
+## Features
+
+- **Universal Feed Support**: Works with both RSS and Atom feeds
+- **Comprehensive Analysis**: Displays all feed metadata and structure
+- **Item Inspector**: Shows the last 10 items with all available fields
+- **Raw XML Viewer**: View the complete XML structure of the feed
+- **CORS Proxy**: Fetches feeds from any domain without CORS issues
+- **Responsive Design**: Works on desktop and mobile devices
+- **Zero Dependencies**: Pure HTML, CSS, and JavaScript
+
+## Usage
+
+1. Open the website in your browser
+2. Paste an RSS or Atom feed URL into the input field
+3. Click "Analyze Feed" or press Enter
+4. View the detailed breakdown of your feed
+
+### Try the Example Feeds
+
+The tool includes quick-access buttons for popular feeds:
+- Hacker News RSS
+- Reddit Programming
+- GitHub Blog
+
+## What You'll See
+
+### Feed Information
+- Feed type (RSS version or Atom)
+- Title, description, and link
+- Publication dates
+- Language and other metadata
+- Image URLs
+- Generator information
+
+### Latest 10 Items
+For each item, you'll see:
+- All available fields (title, link, description, etc.)
+- Publication dates
+- Authors and categories
+- Custom fields and namespaces
+- Clickable links
+
+### Raw XML Structure
+- Formatted XML view of the entire feed
+- Easy to copy and inspect
+
+## Technical Details
+
+- **Language**: Pure JavaScript (ES6+)
+- **Hosting**: GitHub Pages compatible
+- **CORS Solution**: Uses `allorigins.win` as a proxy
+- **Parsing**: Native DOMParser API
+- **Styling**: Gradient design with responsive layout
+
+## Local Development
+
+Simply open `index.html` in your browser. No build process or server required!
+
+## GitHub Pages Deployment
+
+1. Push this repository to GitHub
+2. Go to repository Settings > Pages
+3. Select the branch (usually `main` or `master`)
+4. Select the root folder
+5. Click Save
+6. Your site will be live at `https://yourusername.github.io/repository-name/`
+
+## Browser Support
+
+Works in all modern browsers that support:
+- ES6 JavaScript
+- Fetch API
+- DOMParser
+- CSS Grid and Flexbox
+
+## License
+
+MIT License - Feel free to use and modify as needed!