#49 add RestSharp demo

[mrdmrd]

The RestSharp example has been added.
Please review it, and if everything looks good, I hope we can add this example to the main branch.

[Copilot]

Pull Request Overview

This PR adds a comprehensive RestSharp demo application to showcase the integration of RestSharp (REST API client) with the Ivy framework, providing an interactive interface for testing various HTTP methods and API operations.

• Interactive UI for REST API testing with support for GET, POST, PUT, PATCH, and DELETE methods
• Request customization capabilities including headers and body content management
• Response handling with status code display and optional JSON formatting

Reviewed Changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
RestsharpDemo.sln	Visual Studio solution file for the demo project
RestsharpDemo.csproj	Project configuration targeting .NET 9.0 with Ivy and RestSharp dependencies
README.md	Comprehensive documentation with features, setup instructions, and educational content
Program.cs	Application entry point with server configuration and Chrome integration
GlobalUsings.cs	Global using statements for common namespaces and RestSharp
Apps/RestsharpApp.cs	Main application logic with interactive UI for REST API testing
.gitignore	Standard .NET gitignore with Ivy-specific additions

---

_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}

[rorychatt]

Minor comment is that for json output you can use Code widget and specify language to be json (or codeinput if you want that type of styling but less recommended)

[rorychatt]

Resolve warnings

[rorychatt]

Great job so far, resolve my comments above, and see feedback by Copilot

[mrdmrd]

@rorychatt, all the comments are resolved.