Moved application code to the Application layer

Imported Win10 project
Code cleanup
WIP - Use common UWP services for Win8.1 and Win10

ModernKeePass10/ViewModels/GroupsViewModel.cs

@@ -0,0 +1,57 @@
+using Autofac;
+using ModernKeePass.Domain.AOP;
+using ModernKeePass.Domain.Entities;
+using ModernKeePass.Domain.Enums;
+using ModernKeePass.Domain.Interfaces;
+using ModernKeePass.ViewModels.ListItems;
+
+namespace ModernKeePass.ViewModels
+{
+    public class GroupsViewModel : NotifyPropertyChangedBase
+    {
+        private string _title;
+        private string _newGroupName;
+
+        public string Title
+        {
+            get => _title;
+            set
+            {
+                _title = value;
+                OnPropertyChanged(nameof(Title));
+            }
+        }
+
+        // TODO: check why binding not working
+        public string NewGroupName
+        {
+            get => _newGroupName;
+            set
+            {
+                _newGroupName = value;
+                OnPropertyChanged(nameof(NewGroupName));
+            }
+        }
+
+        public GroupItemViewModel RootItemViewModel { get; set; }
+
+        public GroupsViewModel(): this(App.Container.Resolve<IDatabaseService>().RootGroupEntity)
+        { }
+
+        public GroupsViewModel(GroupEntity groupEntity)
+        {
+            Title = groupEntity.Name;
+            RootItemViewModel = new GroupItemViewModel(groupEntity, null);
+        }
+
+        public void AddNewGroup(string groupName = "")
+        {
+            var group = new GroupEntity
+            {
+                Name = groupName,
+                Icon = Icon.Folder,
+            };
+            RootItemViewModel.Children.Add(new GroupItemViewModel(group, RootItemViewModel));
+        }
+    }
+}