Improve README with concrete generator examples and DI override explanation

[Copilot]

The README lacked concrete examples of what the source generator produces and how it rewires DI registrations to inject resilience pipelines.

• Generator flow overview: Added a concise walkthrough of how [ResiliencePipeline] methods are detected, validated, and mapped to generated wrappers (interface vs concrete cases).
• Generated class shape: Included a representative snippet showing the emitted wrapper that resolves the pipeline and delegates to the original implementation.
• DI override mechanics: Documented how the generator rewrites AddTransient/Scoped/Singleton registrations to use the generated wrapper while preserving original factories via interceptors.

Example wrapper:

[GeneratedCode("Kinetic2", "1.0.0")]
internal sealed class NotificationService__INotificationService__K2p : INotificationService
{
    private readonly IServiceProvider _serviceProvider;
    private readonly INotificationService _instance;

    internal NotificationService__INotificationService__K2p(IServiceProvider sp, NotificationService instance)
    {
        _serviceProvider = sp;
        _instance = (INotificationService)instance;
    }

    public ValueTask NotifyAsync(string to, string subject, string body) =>
        ResilienceExtensions.ExecuteResiliencePipeline<NotificationService__INotificationService__K2p>(
            _serviceProvider, "NotifyAsyncFromInterface",
            _ => _instance.NotifyAsync(to, subject, body),
            CancellationToken.None);
}

Original prompt

The readme in this repo has way too little ... examples. and it doesnt make it obvious what is being done here. Add sections of the source generated code and especially elaborate on the a) code generation logic and b) the injection and override mechanism of injection a generated class into the existing and unchanged DI registration. show the structure of the generated class

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