Update README.md

update image path and add caption

README.md

@@ -61,9 +61,7 @@ See the [`Terminal.Gui/` README](https://github.com/gui-cs/Terminal.Gui/tree/mas
 
 ## Sample Usage in C#
 
-The following example shows basic Terminal.Gui application syntax.
-
-![Simple Usage app](docfx/images/simpleusage.png)
+The following example shows basic Terminal.Gui application syntax:
 
 ```csharp
 // A simple Terminal.Gui example in C# - using C# 9.0 Top-level statements
@@ -122,6 +120,12 @@ Application.Run(win);
 Application.Shutdown();
 ```
 
+When run the application looks as follows:
+
+![Simple Usage app](./docfx/images/Example.png)
+
+_Sample application running_
+
 ## Installing
 
 Use NuGet to install the `Terminal.Gui` NuGet package: https://www.nuget.org/packages/Terminal.Gui
@@ -151,4 +155,4 @@ Debates on architecture and design can be found in Issues tagged with [design](h
 
 ## History
 
-See [gui-cs](https://github.com/gui-cs/) for how this project came to be.
+See [gui-cs](https://github.com/gui-cs/) for how this project came to be.