Add readme and screenshot

Author: kzu

assets/run.png

@@ -1 +1,86 @@
-An opinionated meta-package for doing AI agents using Microsoft.Extensions.AI and MCP
+An opinionated meta-package for doing AI agents using Microsoft.Extensions.AI and MCP and dotnet run file.
+
+Examle Claude-based agent:
+
+![](https://raw.githubusercontent.com/devlooped/smith/main/assets/run.png)
+
+```csharp
+#:package Smith@0.*
+
+var configuration = new ConfigurationBuilder()
+    .AddEnvironmentVariables()
+    .AddUserSecrets()
+    .AddJsonFile("appsettings.json", optional: true, reloadOnChange: true)
+    .AddIniFile("appsettings.ini", optional: true, reloadOnChange: true)
+    .Build();
+
+var services = new ServiceCollection();
+
+services.AddHttpClient("ai").AddStandardResilienceHandler();
+
+services.AddChatClient(services => new Anthropic.AnthropicClient(
+    configuration["Claude:Key"] ?? throw new InvalidOperationException("Missing Claude:Key configuration."),
+    services.GetRequiredService<IHttpClientFactory>().CreateClient("ai")))
+    .UseLogging()
+    .UseFunctionInvocation();
+
+var provider = services.BuildServiceProvider();
+var history = new List<ChatMessage> { new ChatMessage(ChatRole.System, Prompts.System) };
+var chat = provider.GetRequiredService<IChatClient>();
+var options = new ChatOptions
+{
+    ModelId = "claude-sonnet-4-20250514",
+    MaxOutputTokens = 1000,
+    Temperature = 0.7f,
+    Tools = [AIFunctionFactory.Create(() => DateTime.Now, "get_datetime", "Gets the current date and time on the user's local machine.")]
+};
+
+AnsiConsole.MarkupLine($":robot: Ready v{ThisAssembly.Info.Version}");
+AnsiConsole.Markup($":person_beard: ");
+while (true)
+{
+    var input = Console.ReadLine()?.Trim();
+    if (string.IsNullOrEmpty(input))
+        continue;
+
+    history.Add(new ChatMessage(ChatRole.User, input));
+
+    try
+    {
+        var response = await AnsiConsole.Status().StartAsync(":robot: Thinking...",
+            ctx => chat.GetResponseAsync(input, options));
+
+        history.AddRange(response.Messages);
+        // Try rendering as formatted markup
+        try
+        {
+            if (response.Text is { Length: > 0 })
+                AnsiConsole.MarkupLine($":robot: {response.Text}");
+        }
+        catch (Exception)
+        {
+            // Fallback to escaped markup text if rendering fails
+            AnsiConsole.MarkupInterpolated($":robot: {response.Text}");
+        }
+
+        AnsiConsole.WriteLine();
+        AnsiConsole.Markup($":person_beard: ");
+    }
+    catch (Exception e)
+    {
+        AnsiConsole.WriteException(e);
+    }
+}
+
+static class Prompts
+{
+    public const string System =
+        """
+        Your responses will be rendered using Spectre.Console.AnsiConsole.Write(new Markup(string text))). 
+        This means that you can use rich text formatting, colors, and styles in your responses, but you must 
+        ensure that the text is valid markup syntax. 
+        """;
+}
+```
+
+<!-- include https://github.com/devlooped/sponsors/raw/main/footer.md -->