added video of shape keys.

src/docs/asciidoc/jme3/external/blender/blender_gltf.adoc

@@ -62,6 +62,11 @@ Shape keys in Blender are used to apply a deformation to a mesh without changing
 Shape keys are supported as of jME version 3.3.0-beta2+. Use the PBRLighting.j3md material definition when doing so.
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+.youtube
+image::jme3/external/DZQ6HJgUheY.png[youtu.be/DZQ6HJgUheY,width="",height="",link=https://youtu.be/DZQ6HJgUheY]
+
+
+
 == Export options
 
 Blender 2.8 supports many options when exporting in glTF format. Most of the default options work fine.