Add comprehensive project descriptions and capabilities to README

[konard]

Summary

• Enhanced README.md with detailed descriptions explaining what Platform.Data can accomplish
• Added comprehensive project overview explaining the universal data abstraction concept
• Included practical usage examples demonstrating core ILinks interface operations
• Added architecture overview explaining the layered design and integration points

Key Additions

Project Description

• What is Platform.Data? - Clear explanation of the library's purpose as a foundational tool for link-based data structures
• Key Capabilities - Detailed breakdown of Universal Data Abstraction, Core Operations, Data Management Features, and Architecture Benefits

Getting Started Guide

• Prerequisites - Requirements for using the library
• Installation - Multiple installation methods (NuGet, Package Manager, PackageReference)
• Essential Concepts - Explanation of TLinkAddress, Restrictions, Handlers, and Constants
• Understanding Link Structures - Clear explanation of doublets, triplets, and n-tuples

Practical Examples

• Complete code examples showing how to work with the ILinks<TLinkAddress, TConstants> interface
• Demonstrations of counting, creating, and querying operations
• Pattern matching examples with restriction arrays

Use Cases

• Graph Database Foundation - Building custom graph databases
• Data Integration - Universal adapters for different storage systems
• Knowledge Representation - Sophisticated knowledge representation systems
• High-Performance Computing - Optimized data processing pipelines

Architecture Overview

• Core Interface Layer - Explanation of foundational interfaces and generic type system
• Operation Categories - Read/Write operations and handler-based processing
• Key Design Principles - Separation of concerns, type safety, performance, extensibility
• Integration Points - How the library enables multiple implementations and interoperability

Test Plan

• Verified README formatting renders correctly
• Ensured all existing links and references remain intact
• Confirmed code examples use proper C# syntax
• Validated that enhanced descriptions align with actual codebase capabilities

🤖 Generated with Claude Code

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Resolves #138