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

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

@@ -1,35 +1,37 @@
----
-title: 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`.
-
-## Example
-```csharp
-using System;
-
-namespace HelloWorld
-{
-    class Hello
-    {
-        static void Main()
-        {
-            // Write "Hello World!" on console
-            Console.WriteLine("Hello World!");
-
-            // Keep the console window open in debug mode.
-            Console.WriteLine("Press any key to exit.");
-            Console.ReadKey();
-        }
-    }
-}
-
-```
-
-## Output:
-```sh
-> Hello World!
-> Press any key to exit.
-```
+---
+title: 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`.
+
+The method `Console.ReadKey()` waits for a user to press any key. 
+
+## Example
+```csharp
+using System;
+
+namespace HelloWorld
+{
+    class Hello
+    {
+        static void Main()
+        {
+            // Write "Hello World!" on console
+            Console.WriteLine("Hello World!");
+
+            // Keep the console window open in debug mode.
+            Console.WriteLine("Press any key to exit.");
+            Console.ReadKey();
+        }
+    }
+}
+
+```
+
+## Output:
+```sh
+> Hello World!
+> Press any key to exit.
+```