-addstr
template: ster?clnt=<name|pass>&com=addstr&str=<str>[&<attr_1>=<val_1>&<ftr_2>=...]
          Order of query params is not important. Feature
          names must not end with '*' to be legal. Stereotype
          names must not be '*', '-', or empty string.
descript: the new stereotype is inserted in the DB. The (attribute,
          value) pairs for that stereotype are then inserted in
          the DB. Must be used to initialize the stereotype
          service (a stereotype must already exists for a user to
          reference to it). Can also be used to add more attributes
          in an existing stereotype. Note that if no (attribute, value)
          pairs exist in the request, the stereotype will still
          be inserted, and users will be able to refer to it. If
          the stereotype already exists, then it will not be inserted
          (200 OK will still be returned). If one or more of the
          specified attribute already exist for that stereotype, or if
          one or more attribute names are not legal names, code 401
          (request error) will be returned. If the error code 401 is
          returned then no change has taken place in the DB.
example : ster?clnt=name|pass&com=addstr&str=educated&expert.computer=yes&educ=3
returns : 200 OK, 401 (fail, request error), 501 (fail, server error)
200 OK  : no response body exists.