Add comprehensive Markdown documentation

[Copilot]

The project lacked structured documentation. Added 7 MD files covering API reference, architecture, development workflow, and contribution guidelines.

Documentation Structure

• README.md - Enhanced with features overview, tech stack, quick reference for endpoints and commands
• API.md - Complete endpoint reference with request/response examples, error codes, client usage in JS/C#/Python
• ARCHITECTURE.md - System components, data models, technology stack, security considerations
• DEVELOPMENT.md - Setup options (Codespaces/Dev Container/local), build/run/debug workflows, troubleshooting
• CONTRIBUTING.md - Code style guidelines, PR process, bug/feature templates, CLA requirements
• CHANGELOG.md - Version history following Keep a Changelog format
• DOCS_INDEX.md - Navigation sitemap with task-based routing and topic index

Key Additions

API Reference Example:

# Weather forecast
curl https://localhost:8080/weatherforecast

# Sunset calculation with parameters
curl "https://localhost:8080/sunset?date=2024-06-21"
curl "https://localhost:8080/sunset/range?days=7"

Architecture Overview:

• Frontend: Blazor Server (port 8081) → Backend: ASP.NET Core Minimal API (port 8080)
• OpenAPI/Scalar integration for interactive docs at /scalar
• Dev container with .NET 9.0 SDK, GitHub CLI, Azure Dev CLI

Total: 1,403 lines of documentation with cross-references and external resource links.

Original prompt

write documents in .md format for this project

Created from Copilot CLI via the copilot delegate command.

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💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.