Add comprehensive deployment guide and core security principles to README

[Copilot]

This PR enhances the README with comprehensive deployment guidance and detailed explanation of the core security principles behind the AKS Secure Baseline architecture, as requested in the issue.

Changes Made

🔐 Core Security Principles Section

Added a dedicated section explaining the 6 foundational security principles:

• Zero Trust Network Architecture - Single public entry point, all other resources private
• Defense in Depth - Multiple security layers (WAF → Network Policies → Pod Security → RBAC)
• Principle of Least Privilege - Workload Identity, Azure RBAC, minimal permissions
• Network Segmentation - Separate subnets, NSGs, private endpoints
• Credential-Free Authentication - Workload Identity federation, CSI Secret Store
• Continuous Monitoring & Audit - Log Analytics, diagnostic settings, alerts

Each principle includes the principle definition, implementation details, and links to relevant Microsoft documentation.

🚀 Enhanced Deployment Guide

Replaced the basic "Quick Start" section with a comprehensive deployment guide including:

• Prerequisites: Detailed tool and Azure requirements
• Step-by-Step Deployment: 5 clear phases from environment setup to cluster access
• Deployment Verification: Infrastructure health checks and security validation
• Quick Start Option: Minimal setup for basic deployment
• Troubleshooting: Reference to detailed deployment guide

📖 Microsoft Best Practices Implementation

Added a comprehensive section mapping the implementation to specific Microsoft documentation:

• AKS Secure Baseline Architecture
• Container Networking Best Practices (CNI Overlay, Cilium)
• Identity and Access Management (Workload Identity, Azure RBAC)
• Network Security Best Practices
• Security and Compliance
• Cloud Adoption Framework (CAF)
• Operations and Monitoring
• Performance and Scalability

📚 Enhanced Resources Section

Reorganized and expanded the documentation links:

• Microsoft Official Documentation (16 links organized by category)
• Project Documentation (8 existing guides)
• Additional Resources (4 fundamental references)

Key Improvements

• 50+ Microsoft Documentation References: Comprehensive coverage of implemented best practices
• Clear Deployment Path: Step-by-step guidance from prerequisites to verification
• Security Principle Mapping: Clear explanation of why each security control was implemented
• Better Organization: Categorized resources for easier navigation

Impact

The README now provides:

1. Clear deployment instructions for new users
2. Understanding of core principles behind the architecture
3. Comprehensive Microsoft documentation links for each implemented best practice
4. Better discoverability of existing detailed guides

All changes are additive and preserve the existing structure while significantly enhancing the documentation quality and usability.

Fixes #1.

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