Added information about the Console.ReadKey() (#21922)

guide/english/csharp/hello-world/index.md

@@ -1,35 +1,37 @@
----
+---
-title: Hello World
+title: Hello World
----
+---
-
+
-# Hello World
+# Hello World
-
+
-To write some text on the console we use the `Console.WriteLine()`. This method takes a string as input and has a return type of `void`.
+To write some text on the console we use the `Console.WriteLine()`. This method takes a string as input and has a return type of `void`.
-
+
-## Example
+The method `Console.ReadKey()` waits for a user to press any key. 
-```csharp
+
-using System;
+## Example
-
+```csharp
-namespace HelloWorld
+using System;
-{
+
-    class Hello
+namespace HelloWorld
-    {
+{
-        static void Main()
+    class Hello
-        {
+    {
-            // Write "Hello World!" on console
+        static void Main()
-            Console.WriteLine("Hello World!");
+        {
-
+            // Write "Hello World!" on console
-            // Keep the console window open in debug mode.
+            Console.WriteLine("Hello World!");
-            Console.WriteLine("Press any key to exit.");
+
-            Console.ReadKey();
+            // Keep the console window open in debug mode.
-        }
+            Console.WriteLine("Press any key to exit.");
-    }
+            Console.ReadKey();
-}
+        }
-
+    }
-```
+}
-
+
-## Output:
+```
-```sh
+
-> Hello World!
+## Output:
-> Press any key to exit.
+```sh
-```
+> Hello World!
+> Press any key to exit.
+```