Doc: Edit info about Qt Quick 3D View type

Add screenshots.

Change-Id: I06cb35deabb7c4a2bb6fda3b47dfc3ee49be1b32
Reviewed-by: Thomas Hartmann <thomas.hartmann@qt.io>

doc/qtdesignstudio/src/qtquick3d-editor/qtdesignstudio-3d-view.qdoc

@@ -1,6 +1,6 @@
 /****************************************************************************
 **
-** Copyright (C) 2019 The Qt Company Ltd.
+** Copyright (C) 2020 The Qt Company Ltd.
 ** Contact: https://www.qt.io/licensing/
 **
 ** This file is part of the Qt Design Studio documentation.
@@ -31,6 +31,13 @@
 
     \title Adding 3D Views
 
+    To display \l {Qt Quick 3D} types in the \uicontrol Library, select
+    \uicontrol Library > \uicontrol {QML Imports} > \uicontrol {Add Import} >
+    \uicontrol QtQuick3D. The types are displayed in the \uicontrol {QML Types}
+    tab.
+
+    \image studio-qtquick-3d-components.png
+
     To add a 3D view to the scene, drag and drop a \uicontrol {View 3D}
     component from \uicontrol Library > \uicontrol {QML Types} >
     \uicontrol {Qt Quick 3D} to the 3D editor or to the \uicontrol Navigator.
@@ -38,6 +45,8 @@
     and model. A default material is attached to the model. You can attach
     textures to materials.
 
+    \image studio-navigator-view3d.png "View 3D component in the Navigator"
+
     By default, a directional light and a perspective camera are used.
     To use other light and camera types, change the type of the component in
     the \uicontrol Type field in the \uicontrol Properties view. For example,
@@ -49,6 +58,8 @@
     or in the \uicontrol Navigator and modify the property values in the
     \uicontrol Properties view.
 
+    \image studio-qtquick-3d-view.png "View 3D component properties"
+
     For more information about the available components and their properties,
     see \l{Using 3D Components}.
 */