add facade pattern

Author: HamidMosalla

Facade/Program.cs

@@ -6,7 +6,18 @@ class Program
     {
         static void Main(string[] args)
         {
-            //More info: https://en.wikipedia.org/wiki/Facade_pattern
+            /*
+             * More info: https://en.wikipedia.org/wiki/Facade_pattern
+             What problems can the Facade design pattern solve?
+
+                To make a complex subsystem easier to use,
+                a simple interface should be provided for a set of interfaces in the subsystem.
+                The dependencies on a subsystem should be minimized.
+
+            Clients that access a complex subsystem directly refer to (depend on) many different objects
+            having different interfaces (tight coupling),
+            which makes the clients hard to implement, change, test, and reuse.
+                         */
 
             var facade = new CarFacade.CarFacade();