Make a new node for participants.

def create_node(self, network, participant):
        """Make a new node for participants."""
        if network.role == "practice" or network.role == "catch":
            return RogersAgentFounder(network=network, participant=participant)
        elif network.size(type=Agent) < network.generation_size:
            return RogersAgentFounder(network=network, participant=participant)
        else:
            return RogersAgent(network=network, participant=participant)