If you don't want readme.txt file to be created, you can select "Show empty folders in project pane" option in the "Create Folder" dialog.
readme.txt also says: "You can avoid creation of the readme.txt file in the future by configuring the Applications window to display empty folders. To do so, enable the "Show Empty Folders" setting on the display options of the Projects pane."
Note: This option is available in 12c but not in 188.8.131.52.0.
Message was edited by: Sireesha Pinninti