docs: work on README

tests/AnthropicClient.Tests/Examples/ExampleAttribute.cs

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+namespace AnthropicClient.Tests.Examples;
+
+public class ExampleAttribute : FactAttribute
+{
+  public ExampleAttribute()
+  {
+    var skipExamples = Environment.GetEnvironmentVariable("SKIP_EXAMPLES");
+
+    if (skipExamples == "true")
+    {
+      Skip = "Example";
+    }
+  }
+}

tests/AnthropicClient.Tests/Examples/Examples.cs

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+#pragma warning disable xUnit1004
+
+using Xunit.Abstractions;
+
+namespace AnthropicClient.Tests.Examples;
+
+public class Examples(ConfigurationFixture config, ITestOutputHelper console) : IClassFixture<ConfigurationFixture>
+{
+  private readonly ITestOutputHelper _console = console;
+  private readonly AnthropicApiClient _client = new(config.AnthropicApiKey, new());
+
+  [Example]
+  public async Task CreateMessage()
+  {
+    var response = await _client.CreateMessageAsync(new MessageRequest(
+      AnthropicModels.Claude3Haiku,
+      [
+        new(
+          MessageRole.User, 
+          [new TextContent("Please write a haiku about the ocean.")]
+        )
+      ]
+    ));
+
+    if (response.IsSuccess is false)
+    {
+      _console.WriteLine($"Failed to create message");
+      _console.WriteLine($"Error Type: {0}", response.Error.Error.Type);
+      _console.WriteLine($"Error Message: {0}", response.Error.Error.Message);
+    }
+
+    foreach (var content in response.Value.Content)
+    {
+      switch (content)
+      {
+        case TextContent textContent:
+          _console.WriteLine(textContent.Text);
+          break;
+      }
+    }
+  }
+  
+  [Example]
+  public async Task CreateAndStreamMessage()
+  {
+    var events = _client.CreateMessageAsync(new StreamMessageRequest(
+      AnthropicModels.Claude3Haiku,
+      [
+        new(
+          MessageRole.User, 
+          [new TextContent("Please write a haiku about the ocean.")]
+        )
+      ]
+    ));
+
+    var msgBuilder = new StringBuilder();
+
+    await foreach (var e in events)
+    {
+      switch (e.Data)
+      {
+        case var data when data is ContentDeltaEventData contentData:
+          switch (contentData.Delta)
+          {
+            case var delta when delta is TextDelta textDelta:
+              msgBuilder.Append(textDelta.Text);
+              break;
+          }
+          break;
+      }
+    }
+
+    _console.WriteLine(msgBuilder.ToString());
+  }
+
+  [Example]
+  public async Task CreateStreamMessageAndGetCompleteMessageResponse()
+  {
+    var events = _client.CreateMessageAsync(new StreamMessageRequest(
+      AnthropicModels.Claude3Haiku,
+      [
+        new(
+          MessageRole.User, 
+          [new TextContent("Please write a haiku about the ocean.")]
+        )
+      ]
+    ));
+
+    MessageResponse? response = null;
+
+    await foreach (var e in events)
+    {
+      switch (e.Data)
+      {
+        case var data when data is MessageCompleteEventData msgData:
+          response = msgData.Message;
+          break;
+      }
+    }
+
+    var textContent = response?.Content
+      .OfType<TextContent>()
+      .Aggregate(new StringBuilder(), (sb, c) => sb.Append(c.Text))
+      .ToString();
+
+    _console.WriteLine(textContent);
+  }
+}