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ToDoList/ViewModels/AddItemViewModel.cs

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+using System;
+
+namespace ToDoList.ViewModels
+{
+    public class AddItemViewModel : ViewModelBase
+    {
+        public string Description { get; set; } = String.Empty;
+    }
+}

ToDoList/ViewModels/MainWindowViewModel.cs

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+using ReactiveUI;
+using ToDoList.Services;
+
+namespace ToDoList.ViewModels
+{
+    public class MainWindowViewModel : ViewModelBase
+    {
+        private ViewModelBase _contentViewModel;
+
+        //this has a dependency on the ToDoListService
+
+        public MainWindowViewModel()
+        {
+            var service = new ToDoListService();
+            ToDoList = new ToDoListViewModel(service.GetItems());
+            _contentViewModel = ToDoList;
+        }
+
+        public ToDoListViewModel ToDoList { get; }
+        
+        public ViewModelBase ContentViewModel
+        {
+            get => _contentViewModel;
+            private set => this.RaiseAndSetIfChanged(ref _contentViewModel, value);
+        }
+
+        public void AddItem()
+        {
+            ContentViewModel = new AddItemViewModel();
+        }
+    }
+}

ToDoList/ViewModels/ToDoListViewModel.cs

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+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using ToDoList.DataModel;
+
+namespace ToDoList.ViewModels
+{
+    public class ToDoListViewModel : ViewModelBase
+    {
+        public ToDoListViewModel(IEnumerable<ToDoItem> items)
+        {
+            ListItems = new ObservableCollection<ToDoItem>(items);
+        }
+
+        public ObservableCollection<ToDoItem> ListItems { get; }
+    }
+}

ToDoList/ViewModels/ViewModelBase.cs

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+using ReactiveUI;
+
+namespace ToDoList.ViewModels;
+
+public class ViewModelBase : ReactiveObject
+{
+}