kleine toevoegingen

link van de documenttitle gemaakt
path naar projectmap in uploadmapje

links die kunnen helpen met downloadding
https://vaadin.com/forum/-/message_boards/view_message/308689

https://vaadin.com/wiki/-/wiki/Main/Letting%20the%20user%20download%20a%20file
https://vaadin.com/forum/-/message_boards/view_message/85012