adds devui integration and samples

dotnet/samples/DevUIIntegration/WriterAgent/Program.cs

@@ -0,0 +1,30 @@
+using Azure.Identity;
+using Microsoft.Agents.AI.Hosting;
+
+var builder = WebApplication.CreateBuilder(args);
+
+builder.AddServiceDefaults();
+
+builder.AddAzureChatCompletionsClient(connectionName: "foundry",
+    configureSettings: settings =>
+        {
+            settings.TokenCredential = new DefaultAzureCredential();
+            settings.EnableSensitiveTelemetryData = true;
+        })
+    .AddChatClient("gpt-4.1");
+
+builder.AddAIAgent("writer", "You write short stories (300 words or less) about the specified topic.");
+
+// Register services for OpenAI responses and conversations
+builder.Services.AddOpenAIResponses();
+builder.Services.AddOpenAIConversations();
+
+var app = builder.Build();
+
+// Map OpenAI API endpoints — DevUI aggregator routes requests here
+app.MapOpenAIResponses();
+app.MapOpenAIConversations();
+
+app.MapDefaultEndpoints();
+
+app.Run();