code: func (n *Network) CreateAndJoinChannel(o *Orderer, channelName string) {
  	peers := n.PeersWithChannel(channelName)
  	if len(peers) == 0 {
  		return
  	}
  
  	n.CreateChannel(channelName, o, peers[0])
  	n.JoinChannel(channelName, o, peers...)
  }
docs: // CreateAndJoinChannel will create the specified channel. The referencing
  // peers will then be joined to the channel.
  //
  // The network must be running before this is called.