feat: create chat message

src/AnthropicClient/Models/TextContent.cs

@@ -0,0 +1,34 @@
+using System.Text.Json.Serialization;
+
+using AnthropicClient.Utils;
+
+namespace AnthropicClient.Models;
+
+/// <summary>
+/// Represents text content that is part of a chat message.
+/// </summary>
+public class TextContent : Content
+{
+  /// <summary>
+  /// Gets the text of the content.
+  /// </summary>
+  public string Text { get; init; } = string.Empty;
+
+  [JsonConstructor]
+  internal TextContent() : base(ContentType.Text)
+  {
+  }
+
+  /// <summary>
+  /// Initializes a new instance of the <see cref="TextContent"/> class.
+  /// </summary>
+  /// <param name="text">The text of the content.</param>
+  /// <exception cref="ArgumentNullException">Thrown when the text is null.</exception>
+  /// <returns>A new instance of the <see cref="TextContent"/> class.</returns>
+  public TextContent(string text) : base(ContentType.Text)
+  {
+    ArgumentValidator.ThrowIfNull(text, nameof(text));
+
+    Text = text;
+  }
+}