Added Step in Animation creation

Switch to rotation mode Quaternion to prevent some crazy animation issues

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

@@ -62,6 +62,8 @@ To create an animation from scratch do the following:
 **  image:jme3/external/blender-action-editor.png[blender-action-editor.png,with="",height=""]
 
 *  Add an action by pressing the plus button
+*  Set the rotationmode of the bone to Quaternion or switch later from your rotationmode to Quaternion and make a keyframe
+**  image:jme3/external/blender-switch-rotationmode.png[blender-switch-rotationmode.png,with="",height=""]
 *  Create the keyframes (select the model armature and press I) along the timeline
 **  image:jme3/external/blender-add-keyframes.png[blender-add-keyframes.png,with="",height=""]