docs: work on README

src/AnthropicClient/Models/MessageResponse.cs

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+using System.Text.Json.Serialization;
+
+namespace AnthropicClient.Models;
+
+/// <summary>
+/// Represents a response.
+/// </summary>
+public class MessageResponse
+{
+  /// <summary>
+  /// Gets the ID of the response.
+  /// </summary>
+  public string Id { get; init; } = string.Empty;
+
+  /// <summary>
+  /// Gets the model used for the response.
+  /// </summary>
+  public string Model { get; init; } = string.Empty;
+
+  /// <summary>
+  /// Gets the role of the response.
+  /// </summary>
+  public string Role { get; init; } = string.Empty;
+
+  /// <summary>
+  /// Gets the stop reason of the response.
+  /// </summary>
+  [JsonPropertyName("stop_reason")]
+  public string? StopReason { get; init; }
+
+  /// <summary>
+  /// Gets the stop sequence of the response.
+  /// </summary>
+  [JsonPropertyName("stop_sequence")]
+  public string? StopSequence { get; init; }
+
+  /// <summary>
+  /// Gets the type of the response.
+  /// </summary>
+  public string Type { get; init; } = string.Empty;
+
+  /// <summary>
+  /// Gets the usage of the response.
+  /// </summary>
+  public Usage Usage { get; init; } = new();
+
+  /// <summary>
+  /// Gets the contents of the response.
+  /// </summary>
+  public List<Content> Content { get; init; } = [];
+
+  /// <summary>
+  /// Gets the tool call of the response. If the response does not contain a tool call, this property is null.
+  /// </summary>
+  [JsonIgnore]
+  public ToolCall? ToolCall { get; set; } = null;
+}