Update test/README.md

Author: stefanogabriele

test/README.md

@@ -85,5 +85,7 @@ Each sample should be as minimal as possible showing the strict necessary for fu
 	* `v3` Varius improvements to `mlj` library. Now is possible to load multiple mesh file at the same time.
 	* `v4` Graphics restyling and graphics features added. Now is possible to resize the tools pane, the widgets (layers, tabbed pane and log) are wrapped inside a split pane and can be resized. The files structure of `mlj` library was modified to meet logical dependencies.
 	* `elements` Contains demos of common graphic elements of MeshLabJs. These elements are implemented like abstractions of jQueryUI widget.
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+* `MeshLabJSdat.GUI` The folder contains the first version of MeshLabJS where the graphic user interface is implemented using dat.GUI library.