code: public Client createClient(Client client, AccessToken accessToken) {
          return getAuthService().createClient(client, accessToken);
      }
docs: Create a client.
  
  @param client      the client to create
  @param accessToken the access token used to access the service
  @return The created client
  @throws UnauthorizedException             if the accessToken is not valid
  @throws ConnectionInitializationException if the connection to the given OSIAM service could not be initialized
  @throws ClientAlreadyExistsException      if the client with the clientId already exists
  @throws IllegalStateException             if OSIAM's endpoint(s) are not properly configured