Add project files.

OemanTrader.WPF/State/Navigators/INavigator.cs

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+using OemanTrader.WPF.ViewModels;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows.Input;
+
+namespace OemanTrader.WPF.State.Navigators
+{
+    public enum ViewType
+    {
+        Home,
+        Portfolio
+    }
+    public interface INavigator
+    {
+        ViewModelBase CurrentViewModel { get; set; }
+        ICommand UpdateCurrentViewModelCommand { get; }
+    }
+}

OemanTrader.WPF/State/Navigators/Navigator.cs

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+using OemanTrader.WPF.Commands;
+using OemanTrader.WPF.Models;
+using OemanTrader.WPF.ViewModels;
+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows.Input;
+
+namespace OemanTrader.WPF.State.Navigators
+{
+    public class Navigator : ObservableObject, INavigator
+    {
+        private ViewModelBase _currentViewModel;
+        public ViewModelBase CurrentViewModel
+        {
+            get
+            {
+                return _currentViewModel;
+            }
+
+            set
+            {
+                _currentViewModel = value;
+                OnPropertyChanged(nameof(CurrentViewModel));
+            }
+        }
+        public ICommand UpdateCurrentViewModelCommand => new UpdateCurrentViewModelCommand(this);
+
+
+    }
+}