Add comprehensive project documentation

[Copilot]

The vulnerable-node project lacked structured documentation beyond a basic README. Added ~2000 lines of docs covering architecture, vulnerabilities, and attack guides.

Changes

• README.md - Restructured with table of contents, API endpoints, installation options (Docker/manual), and security disclaimer
• CONTRIBUTING.md - Development setup, PR process, code style, guidelines for adding new vulnerabilities
• docs/ARCHITECTURE.md - System diagrams (Mermaid), database schema, request flow, technology stack
• docs/VULNERABILITIES.md - OWASP Top 10 mapping with exact code locations, attack vectors, example payloads
• docs/ATTACKS.md - Usage guide for attacks/ scripts (SQLi, CSRF, ReDoS, log injection)

Example

Vulnerability documentation now includes precise code references:

// model/auth.js (Line 7) - SQL Injection
var q = "SELECT * FROM users WHERE name = '" + username + "' AND password ='" + password + "';";

With attack payloads:

' OR '1'='1' --

Original prompt

Create documentation for this project

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