is there a way to allow users to add an attachment to the jotform questionaire before submitting?

You can include an upload field in your form:

You might want to find this guides useful on regards of upload forms:

http://www.jotform.com/help/29-Upload-Field-Allowed-File-Types 

http://www.jotform.com/help/33-Changing-the-Upload-Size-Limit 

Let us know if you need more help.