Create link to “New Item”

<a href=”javascript:OpenPopUpPageWithTitle(‘</site/library>/_layouts/15/Upload.aspx?List={<List-GUID>}&RootFolder=&IsDlg=1′,RefreshOnDialogClose,null,null,'<Title>’);”>Add item</a>

Create link to “New Folder”

<a href=”javascript:OpenPopUpPageWithTitle(‘</site/library>/Forms/Upload.aspx?RootFolder=&Type=1&IsDlg=1′,RefreshOnDialogClose,null,null,'<Title>’);” >New Folder</a>