Add basic memento pattern

src/MememntoPattern/MementoPatternExamples.cs

@@ -0,0 +1,60 @@
+using MememntoPattern.Employee;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+
+namespace MememntoPattern
+{
+    // This project can output the Class library as a NuGet Package.
+    // To enable this option, right-click on the project and select the Properties menu item. In the Build tab select "Produce outputs on build".
+    public class MementoPatternExamples
+    {
+        public MementoPatternExamples()
+        {
+                       
+        }
+
+        public void Run()
+        {
+            Console.WriteLine(GetWhenToUse());
+            Console.WriteLine(GetActors());
+            Console.WriteLine(GetAlternatives());
+
+            GoToNextStep();
+
+            EmployeeExample empExample = new EmployeeExample();
+            empExample.Run();
+        }
+
+        string GetWhenToUse()
+        {
+            return @"When to use:
+When you need to be able to track the state of an object,or/and restore previous states as needed
+When you cannot use simple operation undo/redo, by saving the commands (when there are side effects to the operations) - example translation";
+        }
+
+        
+
+        string GetAlternatives()
+        {
+            return @"Alternatives:
+Command undo - when operations maybe undone
+Iterative Memento - Save the changes, instead of storing the entire state again like GIT";
+        }
+
+        string GetActors()
+        {
+            return @"Actors:
+Originator: object that we want to save. It will create the actual memento.
+Caretaker: keeps the mementos
+Memento: (Magic cookie) internal state of the object";
+        }
+
+        private static void GoToNextStep()
+        {
+            Console.ReadKey();
+            Console.Clear();
+        }
+    }
+}