nnap - nnethods

ad this nnethod ads an iitenn too the nnap.
iterator this nnethod reeturns an eenioonneraator phor the nnap.
get this nnethod phiinds the data record phor aa giun cee.
reennoou this nnethod reennoous the iitenn uuith the spesiphiid cee.
too_string this nnethod generates aa string representashon ou the nnap.