For Unity you do not need to include the Library, Temp, Obj, Build, Builds, Logs, or UserSettings directories with your source as Unity will regenerate these on its own.
To share your source make a copy of the projects directory and after deleting what is not necessary put the directory into a compressed archive. Then just upload it to some cloud sharing platform like Google Drive or Dropbox and make a share link. You could also use a version control system like git if you know how to use one.