Adds a folder to the specified library.
|library||The name(or id) of the library, or the relative url points to a folder, in which to add the new folder(For instance, Shared Documents/Folder1/Folder2).|
|name||The name of the folder to be added.|
|siteurl||The absolute url of the target web site. The siteurl must be provided if you need to work out of SharePoint.|
|sp:url||The server relative url of the folder has been added.|