what do you mean by project ... back office management, source files access, database ???
and from which password are you thinking to ?... data bases password, FTP users password, backoffice access password , creative cloud library ??
Upload your work to a public web space you control and send your collaborator the URL. For example, https:// yoursite . com / client_name/
Or if you don't have web hosting set-up yet, Zip up your local site folder and send it to your collaborator by e-mail They will need to unzip the folder at their end to open files in a browser or code editor.