feat: create chat message

src/AnthropicClient/Models/NotFoundError.cs

@@ -0,0 +1,24 @@
+using System.Text.Json.Serialization;
+
+namespace AnthropicClient.Models;
+
+/// <summary>
+/// Represents a not_found error.
+/// </summary>
+public class NotFoundError : Error
+{
+  [JsonConstructor]
+  internal NotFoundError() : base(ErrorType.NotFoundError)
+  {
+  }
+
+  /// <summary>
+  /// Initializes a new instance of the <see cref="NotFoundError"/> class.
+  /// </summary>
+  /// <param name="message">The message of the error.</param>
+  /// <returns>A new instance of the <see cref="NotFoundError"/> class.</returns>
+  public NotFoundError(string message) : base(ErrorType.NotFoundError)
+  {
+    Message = message;
+  }
+}