### Initialize CommandApp with Dependency Injection

Source: https://github.com/wcomab/spectre.console.cli.extensions.dependencyinjection/blob/main/README.md

Demonstrates the initial setup in Program.cs to integrate the DependencyInjectionRegistrar with Spectre.Console.Cli. This allows for services registered in the `ServiceCollection` to be injected into your commands.

```csharp
var services = new ServiceCollection();
// add extra services to the container here
using var registrar = new DependencyInjectionRegistrar(services);
var app = new CommandApp(registrar);
app.Configure(config =>
{
    // configure your commands as per usual
    // commands are automatically added to the container
});
return app.Run(args);
```

--------------------------------

### Inject Services into CLI Commands

Source: https://github.com/wcomab/spectre.console.cli.extensions.dependencyinjection/blob/main/README.md

Shows how to register a custom service (e.g., `ICoolService`) with the `ServiceCollection` and how to inject it into a command class constructor. The `DependencyInjectionRegistrar` handles the instantiation and injection automatically.

```csharp
// Program.cs
var services = new ServiceCollection();
services.AddSingleton<ICoolService, MyCoolService>();
using registrar = new DependencyInjectionRegistrar(services);
var app = new CommandApp(registrar);
app.Configure(config =>
{
    config.AddCommand<SomeCommand>("command");
    // commands are automatically added to the container
});

// in SomeCommand.cs
public class SomeCommand : Command<SomeCommand.Settings>
{
    public SomeCommand(ICoolService service)
    {
        // the `ICoolService` parameter will be automatically injected with an instance of `MyCoolService`
    }

    public override int Execute(SomeCommand.Settings settings, ILookup<string, string> unmapped)
    {
        // command logic here
        return 0;
    }
}
```

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