Add API documentation for GET /api/superheroes/:id endpoint

[Copilot]

Created comprehensive documentation for the superhero retrieval endpoint.

Documentation Added

File: backend/API_DOCUMENTATION.md

• Endpoint specification: URL pattern, parameters, base URLs
• Request examples: curl, JavaScript fetch, and CRA-proxied frontend usage
• Response format: Complete JSON schema with field descriptions for superhero object and powerstats
• Status codes: 200 (success), 404 (not found), 500 (server error) with specific scenarios
• Implementation details: Code snippet showing string-based ID matching and error handling
• Integration notes: Testing commands, related endpoints, data source location

Example Usage

curl http://localhost:3000/api/superheroes/1

Returns:

{
  "id": 1,
  "name": "A-Bomb",
  "image": "https://cdn.jsdelivr.net/gh/akabab/superhero-api@0.3.0/api/images/lg/1-a-bomb.jpg",
  "powerstats": {
    "intelligence": 38,
    "strength": 100,
    "speed": 17,
    "durability": 80,
    "power": 24,
    "combat": 64
  }
}

Documentation includes practical examples for direct API calls, JavaScript integration, and React frontend usage with the CRA proxy configuration.

Original prompt

generate documentation for the get superhero by id api

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