Implement complete ASP.NET Core 8.0 Web API with Swagger documentation

[Copilot]

This PR implements a fully functional ASP.NET Core 8.0 Web API from scratch to meet the requirement "I want to build ASP.NET Web APIs". The repository previously contained only a README file, so this creates a complete, production-ready Web API foundation.

What was implemented

Complete ASP.NET Core 8.0 Web API

• Created using dotnet new webapi scaffolding tool with .NET 8.0
• Minimal API architecture with modern C# patterns
• Clean project structure following ASP.NET Core best practices

Key Components Added

• Program.cs - Application entry point with dependency injection and middleware configuration
• AspNetWebApi.csproj - Project file with required NuGet packages (Swashbuckle, OpenAPI)
• Configuration files - appsettings.json, appsettings.Development.json, launchSettings.json
• HTTP test file - AspNetWebApi.http for easy API testing
• .gitignore - Comprehensive exclusion of build artifacts and temporary files

Swagger/OpenAPI Integration

• Interactive API documentation at /swagger endpoint
• Full OpenAPI 3.0 schema generation
• Built-in "Try it out" functionality for testing endpoints
• Automatic request/response model documentation

Sample Weather Forecast API

• GET /weatherforecast endpoint returning JSON data
• Returns 5-day weather forecast with temperature in both Celsius and Fahrenheit
• Demonstrates proper JSON serialization and response formatting
• Includes realistic sample data with random weather conditions

Development Features

• HTTPS support with certificates for secure development
• Multiple launch profiles (HTTP, HTTPS, IIS Express)
• Development environment detection with appropriate logging levels
• Cross-platform compatibility runs on Windows, macOS, and Linux

Usage

cd AspNetWebApi
dotnet restore
dotnet build
dotnet run

Then navigate to:

• Swagger UI: http://localhost:5170/swagger
• API Endpoint: http://localhost:5170/weatherforecast

Screenshot

The screenshot shows the fully functional Swagger UI with interactive API documentation, successful endpoint execution, and proper JSON response formatting.

This implementation provides a solid foundation for building ASP.NET Web APIs and can be easily extended with additional endpoints, authentication, database integration, and other enterprise features.

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