Initial draft of actor runtime abstractions (#197)

* Initial draft of actor runtime abstractions

dotnet/samples/HelloHttpApi/HelloHttpApi.ApiService/Program.cs

@@ -0,0 +1,32 @@
+// Copyright (c) Microsoft. All rights reserved.
+
+using HelloHttpApi.ApiService;
+using HelloHttpApi.ApiService.Utilities;
+
+var builder = WebApplication.CreateBuilder(args);
+
+// Add service defaults & Aspire client integrations.
+builder.AddServiceDefaults();
+
+// Add services to the container.
+builder.Services.AddProblemDetails();
+
+// Configure the chat model and our agent.
+builder.AddKeyedChatClient("chat-model");
+
+builder.AddChatClientAgent(
+    name: "pirate",
+    instructions: "You are a pirate. Speak like a pirate.",
+    chatClientKey: "chat-model");
+
+var app = builder.Build();
+
+// Configure the HTTP request pipeline.
+app.UseExceptionHandler();
+
+// Map the agents HTTP endpoints
+app.MapAgents();
+
+app.MapDefaultEndpoints();
+
+app.Run();