(Minor fix) Fix the link text, refer to the F# example too (#3901)

The sample code was removed and was replaced with a link; the markup was bleeding.

Co-authored-by: Tig <tig@users.noreply.github.com>

Author: ris-work

README.md

@@ -49,14 +49,16 @@ The team is looking forward to seeing new amazing projects made by the community
 
 ## Sample Usage in C#
 
-The following example shows a basic Terminal.Gui application in C#:
-
-[!code-csharp[](./Example/Example.cs)]
+The following example shows a basic Terminal.Gui application in C#:  
+[Example (source)](./Example/Example.cs)
 
 When run the application looks as follows:
 
 ![Simple Usage app](./docfx/images/Example.png)
 
+## Sample usage in F#  
+F# examples are located [here](./FSharpExample/Program.fs)
+
 ## Installing
 
 Use NuGet to install the `Terminal.Gui` NuGet package: https://www.nuget.org/packages/Terminal.Gui