Add "V Playground" to Programming Playgrounds (#6240)

* Add "V Playground" to Programming Playgrounds

* minor change

* Add V to index

* Implement the suggestion
Co-authored-by: NDavid Ordás <3125580+davorpa@users.noreply.github.com>
Co-authored-by: NDavid Ordás <3125580+davorpa@users.noreply.github.com>

more/free-programming-playgrounds.md

@@ -41,6 +41,7 @@
 * [Swift](#swift)
 * [TypeScript](#typescript)
   * [Angular](#angular)
+* [V](#v)
 
 
 ### <a name="c"></a>C
@@ -292,6 +293,11 @@
 * [StackBlitz](https://stackblitz.com/fork/typescript)
 
 
+### V
+
+* [V Playground](https://play.vlang.io) - vlang.io
+
+
 #### Angular
 
 > :information_source: See also &#8230; [AngularJS](#angularjs)