Generate comprehensive README.md for Adi.FunctionApp.RulesEngine

[Copilot]

Added a comprehensive README.md file to document the Azure Function App Rules Engine project. The repository previously lacked any documentation, making it difficult for new developers to understand the project's purpose, architecture, and usage.

What's Added

The new README.md provides complete project documentation including:

• Project Overview: Clear explanation of the rules engine functionality and Azure Function App implementation
• Prerequisites: Required tools and frameworks with direct download links
• Project Structure: Detailed breakdown of all directories and their purposes
• Quick Start Guide: Step-by-step setup instructions for local development
• Configuration Documentation: Examples from appsettings.json showing how to define rule criteria
• API Documentation: HTTP endpoints with curl examples for AccountService and OrderService
• Architecture Explanation: How rules are executed and the flow from HTTP request to rule execution
• Code Examples: Sample implementations for both existing rules (EscalateRule, ForwardRule) and custom extensions
• Testing Instructions: Commands for running unit and integration tests
• Deployment Guides: Both Azure CLI and Visual Studio deployment options
• Extensibility Guide: How to add new rules and services to the engine
• Contributing Guidelines: Development best practices and workflow

Technical Details

The documentation accurately reflects the codebase structure:

• Azure Function App with HTTP triggers in RulesEngineService.cs
• Domain layer with IRulesExecutor, RuleContext, and RuleResult abstractions
• Configurable criteria system using expression trees for dynamic rule resolution
• Existing rule implementations (Escalate and Forward rules)
• Comprehensive testing structure with both unit and integration tests

The README follows modern documentation standards with clear formatting, code examples, and professional presentation that will help developers quickly understand and contribute to the project.

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