Add MVVM Light library

Updated nuget packages

ModernKeePass/ViewModel/MainViewModel.cs

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+using GalaSoft.MvvmLight;
+
+namespace ModernKeePass.ViewModel
+{
+    /// <summary>
+    /// This class contains properties that the main View can data bind to.
+    /// <para>
+    /// Use the <strong>mvvminpc</strong> snippet to add bindable properties to this ViewModel.
+    /// </para>
+    /// <para>
+    /// You can also use Blend to data bind with the tool's support.
+    /// </para>
+    /// <para>
+    /// See http://www.galasoft.ch/mvvm
+    /// </para>
+    /// </summary>
+    public class MainViewModel : ViewModelBase
+    {
+        /// <summary>
+        /// Initializes a new instance of the MainViewModel class.
+        /// </summary>
+        public MainViewModel()
+        {
+            ////if (IsInDesignMode)
+            ////{
+            ////    // Code runs in Blend --> create design time data.
+            ////}
+            ////else
+            ////{
+            ////    // Code runs "for real"
+            ////}
+        }
+    }
+}

ModernKeePass/ViewModel/ViewModelLocator.cs

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+/*
+  In App.xaml:
+  <Application.Resources>
+      <vm:ViewModelLocator xmlns:vm="clr-namespace:ModernKeePass"
+                           x:Key="Locator" />
+  </Application.Resources>
+  
+  In the View:
+  DataContext="{Binding Source={StaticResource Locator}, Path=ViewModelName}"
+
+  You can also use Blend to do all this with the tool's support.
+  See http://www.galasoft.ch/mvvm
+*/
+
+using CommonServiceLocator;
+using GalaSoft.MvvmLight;
+using GalaSoft.MvvmLight.Ioc;
+
+namespace ModernKeePass.ViewModel
+{
+    /// <summary>
+    /// This class contains static references to all the view models in the
+    /// application and provides an entry point for the bindings.
+    /// </summary>
+    public class ViewModelLocator
+    {
+        /// <summary>
+        /// Initializes a new instance of the ViewModelLocator class.
+        /// </summary>
+        public ViewModelLocator()
+        {
+            ServiceLocator.SetLocatorProvider(() => SimpleIoc.Default);
+
+            ////if (ViewModelBase.IsInDesignModeStatic)
+            ////{
+            ////    // Create design time view services and models
+            ////    SimpleIoc.Default.Register<IDataService, DesignDataService>();
+            ////}
+            ////else
+            ////{
+            ////    // Create run time view services and models
+            ////    SimpleIoc.Default.Register<IDataService, DataService>();
+            ////}
+
+            SimpleIoc.Default.Register<MainViewModel>();
+        }
+
+        public MainViewModel Main => ServiceLocator.Current.GetInstance<MainViewModel>();
+
+        public static void Cleanup()
+        {
+            // TODO Clear the ViewModels
+        }
+    }
+}