Minimal documentation for new example

Task-number: QTBUG-80500
Change-Id: Ifdd13bc404dd3ee34d14b339e24a72d647b6796f
Reviewed-by: Laszlo Agocs <laszlo.agocs@qt.io>

examples/quick/scenegraph/vulkantextureimport/doc/src/vulkantextureimport.qdoc

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+/****************************************************************************
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+** Copyright (C) 2019 The Qt Company Ltd.
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+
+/*!
+    \example scenegraph/vulkantextureimport
+    \title Scene Graph - Vulkan Texture Import
+    \ingroup qtquickexamples
+    \brief Shows how to use a texture created directly with use a texture created directly withulkan.
+
+    \image vulkantextureimport-example.jpg
+
+
+    The Vulkan Texture Import example shows how an application can import and
+    use a
+    \l{https://www.khronos.org/registry/vulkan/specs/1.1-extensions/man/html/VkImage.html}
+    {VkImage} in the Qt Quick scene. This provides an alternative to the \l{Scene Graph -
+    Vulkan Under QML}{underlay}, overlay, or \l{Scene Graph - Custom Rendering
+    with QSGRenderNode}{render node} approaches when it comes to integrating
+    native Vulkan rendering.
+
+    This example is equivalent in most ways to the \l{Scene Graph - Metal Texture Import}{Metal Texture Import}
+    example. The Vulkan rendering code is taken from the \l{Scene Graph - Vulkan Under QML}{Vulkan Under QML} example.
+
+  */