Add comprehensive project documentation

DOCS_INDEX.md

@@ -0,0 +1,218 @@
+# Documentation Index
+
+Welcome to the BackCheck.io Verify documentation. This index provides quick access to all available documentation.
+
+## 📚 Quick Links
+
+### Getting Started
+- **[README.md](README.md)** - Project overview, features, and quick start guide
+- **[INSTALLATION.md](INSTALLATION.md)** - Complete installation and setup instructions
+
+### User Documentation
+- **[USER_GUIDE.md](USER_GUIDE.md)** - User roles, features, workflows, and FAQs
+
+### Technical Documentation
+- **[ARCHITECTURE.md](ARCHITECTURE.md)** - System architecture, design patterns, and technical details
+- **[API_DOCUMENTATION.md](API_DOCUMENTATION.md)** - REST API endpoints, authentication, and examples
+- **[CONFIGURATION.md](CONFIGURATION.md)** - Configuration options and environment setup
+- **[INTEGRATIONS.md](INTEGRATIONS.md)** - Third-party integrations (Bitrix, Savvion, Google Sheets, WHMCS)
+- **[DEVELOPMENT.md](DEVELOPMENT.md)** - Development setup, coding standards, and best practices
+
+## 📖 Documentation by Audience
+
+### For End Users (Clients & Analysts)
+1. Start with [README.md](README.md) for an overview
+2. Read [USER_GUIDE.md](USER_GUIDE.md) for detailed usage instructions
+3. Check the FAQ section in the User Guide for common questions
+
+### For System Administrators
+1. [INSTALLATION.md](INSTALLATION.md) - Installing and configuring the system
+2. [CONFIGURATION.md](CONFIGURATION.md) - System configuration and tuning
+3. [INTEGRATIONS.md](INTEGRATIONS.md) - Setting up external integrations
+
+### For Developers
+1. [DEVELOPMENT.md](DEVELOPMENT.md) - Development environment and coding standards
+2. [ARCHITECTURE.md](ARCHITECTURE.md) - Understanding the system architecture
+3. [API_DOCUMENTATION.md](API_DOCUMENTATION.md) - Working with the API
+
+### For API Consumers
+1. [API_DOCUMENTATION.md](API_DOCUMENTATION.md) - Complete API reference
+2. [README.md](README.md#api-integration) - API integration overview
+
+## 📝 Documentation Overview
+
+### README.md
+**Size**: 8.5 KB | **Last Updated**: 2026-02-15
+
+Main project documentation covering:
+- Project overview and features
+- Technology stack
+- Quick start guide
+- User roles
+- API integration overview
+- Support information
+
+### INSTALLATION.md
+**Size**: 13 KB | **Last Updated**: 2026-02-15
+
+Complete installation guide including:
+- System requirements
+- Installation steps (database, web server, configuration)
+- Post-installation tasks
+- Security hardening
+- Backup configuration
+- Troubleshooting common issues
+
+### ARCHITECTURE.md
+**Size**: 23 KB | **Last Updated**: 2026-02-15
+
+Technical architecture documentation:
+- System overview and design patterns
+- Technology stack details
+- Component architecture
+- Database design
+- Security architecture
+- Integration architecture
+- Performance and scalability considerations
+
+### API_DOCUMENTATION.md
+**Size**: 17 KB | **Last Updated**: 2026-02-15
+
+Complete API reference:
+- Authentication (token-based)
+- 8 API endpoints with examples
+- Request/response formats
+- Error handling and codes
+- Rate limiting
+- Code examples (PHP, JavaScript, Python, cURL)
+
+### USER_GUIDE.md
+**Size**: 16 KB | **Last Updated**: 2026-02-15
+
+User documentation covering:
+- 14 user roles and permissions
+- 5 common workflows with step-by-step instructions
+- Features by role (document upload, status tracking, etc.)
+- Dashboard and analytics
+- FAQ section
+- Support information
+
+### CONFIGURATION.md
+**Size**: 15 KB | **Last Updated**: 2026-02-15
+
+Configuration guide including:
+- Configuration file structure
+- Database configuration
+- Application settings (URLs, business logic, etc.)
+- Email configuration (multiple providers)
+- File upload settings
+- Integration settings
+- Security settings
+- Performance tuning
+- Environment-specific configurations
+
+### INTEGRATIONS.md
+**Size**: 18 KB | **Last Updated**: 2026-02-15
+
+Integration documentation:
+- Bitrix CRM integration (lead/task management)
+- Savvion BPM integration (workflow management)
+- Google Sheets integration (reporting)
+- WHMCS integration (billing)
+- Third-party APIs
+- Custom integration development
+- Troubleshooting guides
+
+### DEVELOPMENT.md
+**Size**: 18 KB | **Last Updated**: 2026-02-15
+
+Developer documentation:
+- Development environment setup
+- Code structure and organization
+- Coding standards (PHP, JavaScript, SQL)
+- Development workflow (Git, commits)
+- Testing guidelines
+- Debugging techniques
+- Security best practices
+- Modernization recommendations
+- Common development tasks
+
+## 🔍 Finding What You Need
+
+### Common Topics
+
+**Installation & Setup**
+- New installation → [INSTALLATION.md](INSTALLATION.md)
+- Configuration → [CONFIGURATION.md](CONFIGURATION.md)
+- Environment setup → [DEVELOPMENT.md#development-environment-setup](DEVELOPMENT.md#development-environment-setup)
+
+**User Guides**
+- How to use the system → [USER_GUIDE.md](USER_GUIDE.md)
+- User roles → [USER_GUIDE.md#user-roles-and-permissions](USER_GUIDE.md#user-roles-and-permissions)
+- Workflows → [USER_GUIDE.md#common-workflows](USER_GUIDE.md#common-workflows)
+
+**Development**
+- Getting started → [DEVELOPMENT.md#development-environment-setup](DEVELOPMENT.md#development-environment-setup)
+- Coding standards → [DEVELOPMENT.md#coding-standards](DEVELOPMENT.md#coding-standards)
+- Adding features → [DEVELOPMENT.md#common-tasks](DEVELOPMENT.md#common-tasks)
+
+**API Integration**
+- API overview → [API_DOCUMENTATION.md](API_DOCUMENTATION.md)
+- Authentication → [API_DOCUMENTATION.md#authentication](API_DOCUMENTATION.md#authentication)
+- Endpoints → [API_DOCUMENTATION.md#api-endpoints](API_DOCUMENTATION.md#api-endpoints)
+- Examples → [API_DOCUMENTATION.md#code-examples](API_DOCUMENTATION.md#code-examples)
+
+**Integrations**
+- Bitrix CRM → [INTEGRATIONS.md#bitrix-crm-integration](INTEGRATIONS.md#bitrix-crm-integration)
+- Savvion BPM → [INTEGRATIONS.md#savvion-bpm-integration](INTEGRATIONS.md#savvion-bpm-integration)
+- Google Sheets → [INTEGRATIONS.md#google-sheets-integration](INTEGRATIONS.md#google-sheets-integration)
+
+**Troubleshooting**
+- Installation issues → [INSTALLATION.md#troubleshooting](INSTALLATION.md#troubleshooting)
+- Integration issues → [INTEGRATIONS.md#troubleshooting](INTEGRATIONS.md#troubleshooting)
+- Development issues → [DEVELOPMENT.md#debugging](DEVELOPMENT.md#debugging)
+
+## 📊 Documentation Statistics
+
+- **Total Documentation**: 8 files
+- **Total Size**: ~128 KB
+- **Total Lines**: ~4,850 lines
+- **Last Updated**: 2026-02-15
+- **Version**: 3.4
+
+## 🔄 Documentation Maintenance
+
+### How to Contribute
+
+1. Documentation is written in Markdown format
+2. Follow the existing structure and style
+3. Keep documentation up-to-date with code changes
+4. Test all examples and code snippets
+5. Submit changes via pull request
+
+### Documentation Standards
+
+- Use clear, concise language
+- Provide examples for complex topics
+- Include screenshots where helpful
+- Keep table of contents updated
+- Use proper markdown formatting
+- Maintain consistent structure across files
+
+## 📞 Getting Help
+
+If you can't find what you're looking for in the documentation:
+
+- **Email**: support@backcheckgroup.com
+- **Phone**: +92-21-32863920-31
+- **Website**: https://backcheckgroup.com
+
+## 📜 License
+
+This documentation is proprietary and confidential. All rights reserved by Background Check (Private) Limited.
+
+---
+
+**Documentation Version**: 1.0  
+**Last Updated**: 2026-02-15  
+**Maintained by**: Background Check Development Team