Initial import of the CBDDC codebase with docs and tests. Add a .NET-focused gitignore to keep generated artifacts out of source control.

samples/ZB.MOM.WW.CBDDC.Sample.Console/TodoList.cs

@@ -0,0 +1,41 @@
+using System.Collections.Generic;
+using System.ComponentModel.DataAnnotations;
+
+namespace ZB.MOM.WW.CBDDC.Sample.Console;
+
+public class TodoList
+{
+    /// <summary>
+    /// Gets or sets the document identifier.
+    /// </summary>
+    [Key]
+    public string Id { get; set; } = Guid.NewGuid().ToString();
+
+    /// <summary>
+    /// Gets or sets the list name.
+    /// </summary>
+    public string Name { get; set; } = string.Empty;
+
+    /// <summary>
+    /// Gets or sets the todo items in the list.
+    /// </summary>
+    public List<TodoItem> Items { get; set; } = new();
+}
+
+public class TodoItem
+{
+    /// <summary>
+    /// Gets or sets the task description.
+    /// </summary>
+    public string Task { get; set; } = string.Empty;
+
+    /// <summary>
+    /// Gets or sets a value indicating whether the task is completed.
+    /// </summary>
+    public bool Completed { get; set; }
+
+    /// <summary>
+    /// Gets or sets the UTC creation timestamp.
+    /// </summary>
+    public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
+}