feat: add example code

Author: ikesnowy

sample/Cnblogs.DashScope.Sample/Program.cs

@@ -9,7 +9,7 @@
 using Microsoft.Extensions.AI;
 using ChatMessage = Cnblogs.DashScope.Core.ChatMessage;
 
-const string apiKey = "sk-**";
+const string apiKey = "sk-***";
 var dashScopeClient = new DashScopeClient(apiKey);
 
 Console.WriteLine("Choose the sample you want to run:");
@@ -195,7 +195,9 @@ string GetWeather(WeatherReportParameters parameters)
 
 async Task ChatWithMicrosoftExtensions()
 {
+    Console.WriteLine("Requesting model...");
     var chatClient = dashScopeClient.AsChatClient("qwen-max");
     var response = await chatClient.CompleteAsync("你好，很高兴认识你");
-    Console.WriteLine(JsonSerializer.Serialize(response));
+    var serializerOptions = new JsonSerializerOptions(JsonSerializerDefaults.Web) { WriteIndented = true };
+    Console.WriteLine(JsonSerializer.Serialize(response, serializerOptions));
 }

sample/Cnblogs.DashScope.Sample/SampleTypeDescriptor.cs

@@ -11,6 +11,7 @@ public static string GetDescription(this SampleType sampleType)
             SampleType.ChatCompletion => "Conversation between user and assistant",
             SampleType.ChatCompletionWithTool => "Function call sample",
             SampleType.ChatCompletionWithFiles => "File upload sample using qwen-long",
+            SampleType.MicrosoftExtensionsAi => "Use with Microsoft.Extensions.AI",
             _ => throw new ArgumentOutOfRangeException(nameof(sampleType), sampleType, "Unsupported sample option")
         };
     }