docs: added class diagram of Parameter and ParameterList
docs: added class diagram of Parameter and ParameterList

nismod/smif,willu47/smif,nismod/smif,willu47/smif,willu47/smif,nismod/smif,tomalrussell/smif,tomalrussell/smif,willu47/smif,tomalrussell/smif,tomalrussell/smif,nismod/smif