Create a chTKCat user
Arguments
- x
a chTKCat object
- login
user login
- password
user password (NA ==> no password)
- contact
contact information (can be NA)
- admin
a logical indicating if the user is an admin of the chTKCat instance (default: TRUE)
- provider
a logical indicating if the user is data provider (TRUE) or a data consumer (FALSE: default). If admin is set to TRUE provider will be set to TRUE