Adds a standalone Counter example to demonstrate RazorConsole fundamentals: interactive buttons, state management, and layout components.

Changes

• New example application at examples/Counter/

  • Counter.razor: Three-button counter (increment/decrement/reset) with Figlet header and Panel layout
  • Standard .NET project structure with Razor SDK configuration
  • Local README with usage and feature documentation

• Updated main README: Added Counter to Examples section before LLM Agent TUI as an introductory sample

Example Usage

dotnet run --project examples/Counter

Demonstrates core RazorConsole patterns:

• Event handling with TextButton and OnClick
• State updates with StateHasChanged()
• Layout composition using Rows, Columns, and Panel
• Styled output via Markup and Figlet

• Fixes Counter sample #92

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