code: public Team createTeam(String teamName) throws HelloSignException {
          return new Team(
                  httpClient.withAuth(auth).withPostField(Team.TEAM_NAME, teamName).post(BASE_URI + TEAM_URI).asJson());
      }
docs: Creates a new team for the current user with the given name.
  
  @param teamName String team name
  @return Team
  @throws HelloSignException thrown if there's a problem processing the
  HTTP request or the JSON response.