Updated readme and added new sample project

samples/ReadmeSample/Entities/User.cs

@@ -0,0 +1,16 @@
+using System.Collections;
+using System.Collections.Generic;
+
+namespace ReadmeSample.Entities
+{
+    public class User
+    {
+        public int Id { get; set; }
+
+        public string UserName { get; set; }
+
+        public string EmailAddress { get; set; }
+
+        public ICollection<Order> Orders { get; set; }
+    }
+}