Add command pattern

src/CommandPattern/CommandPatternExamples.cs

@@ -0,0 +1,45 @@
+using CommandPattern.StocksExample;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+
+namespace CommandPattern
+{
+    public class CommandPatternExamples
+    {
+        public static void Run()
+        {
+            Console.WriteLine(GetPatternDescription());
+            GoToNextStep();
+
+            StockExampleRunner stockExampleRunner = new StockExampleRunner();
+            Console.WriteLine(stockExampleRunner.GetDescriptionOfExample());
+            GoToNextStep();
+            stockExampleRunner.Run();
+            stockExampleRunner.Run();
+            stockExampleRunner.Run();
+            stockExampleRunner.Run();
+        }
+
+        private static void GoToNextStep()
+        {            
+            Console.ReadKey();
+            Console.Clear();
+        }
+
+        public static string GetPatternDescription()
+        {
+            return @"
+command pattern is a behavioral design pattern in which an object is used to encapsulate 
+all information needed to perform an action or trigger an event at a later time
+Uses:
+1. Macro recording: f all user actions are represented by command objects, a program can record a 
+sequence of actions simply by keeping a list of the command objects as they are executed.
+2. Undo
+3. GUI buttons and menu items
+4. Parallel processing
+5. Transactional behavior ";
+        }
+    }
+}