Add status endpoint to demonstrate repository editing capability

[Copilot]

This PR demonstrates successful repository editing capability by adding a new /status endpoint while preserving all existing functionality.

Changes Made

New Status Endpoint

Added a /status endpoint that returns service information in JSON format:

{
  "service": "robots-disallow",
  "version": "1.0.0", 
  "timestamp": "2025-08-22T17:46:12.683Z",
  "message": "Repository editing capability demonstrated",
  "endpoints": {
    "/": "Returns robots.txt with 'User-agent: * Disallow: /'",
    "/status": "Returns this status information"
  }
}

Enhanced Request Routing

Modified the main request handler to:

• Check for /status path and route to the new JSON handler
• Maintain original robots.txt functionality for all other paths
• Added proper content-type headers for both text and JSON responses

Updated Documentation

Enhanced README.md with:

• Clear description of both available endpoints
• Usage examples for Docker and local builds
• Feature listing for better user understanding

Project Hygiene

Added proper .gitignore file to exclude:

• Go binary artifacts (robots-disallow)
• Build outputs (*.exe, *.so, etc.)
• Test binaries and coverage files
• Dependency directories

Verification

✅ Backward Compatibility: All existing functionality preserved - requests to /, /robots.txt, or any other path continue to return the expected robots.txt content

✅ New Functionality: The /status endpoint properly returns JSON service information

✅ Build & Deploy: Both local Go builds and Docker container builds work correctly

✅ Testing: Verified both endpoints work as expected in local testing and Docker containers

The implementation uses minimal, surgical changes that add new capability without disrupting existing behavior, successfully demonstrating repository editing capability.

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