Add Outlook Inspired and Stock Market demos

OutlookInspiredApp/DevExpress.OutlookInspiredApp/Common/ViewModel/ISingleObjectViewModel.cs

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+using System;
+using System.ComponentModel.DataAnnotations;
+using System.Linq;
+using System.Linq.Expressions;
+using DevExpress.Mvvm;
+using DevExpress.Mvvm.POCO;
+using DevExpress.Mvvm.DataAnnotations;
+using DevExpress.DevAV.Common.Utils;
+using DevExpress.Mvvm.DataModel;
+
+namespace DevExpress.DevAV.Common.ViewModel {
+    /// <summary>
+    /// The base interface for view models representing a single entity.
+    /// </summary>
+    /// <typeparam name="TEntity">An entity type.</typeparam>
+    /// <typeparam name="TPrimaryKey">An entity primary key type.</typeparam>
+    public interface ISingleObjectViewModel<TEntity, TPrimaryKey> {
+
+        /// <summary>
+        /// The entity represented by a view model.
+        /// </summary>
+        TEntity Entity { get; }
+
+        /// <summary>
+        /// The entity primary key value.
+        /// </summary>
+        TPrimaryKey PrimaryKey { get; }
+    }
+}