code: func (g *Group) Add(memberChannel chan interface{}) *Member {
  	g.memberLock.Lock()
  	g.clockLock.Lock()
  	member := &Member{
  		group:        g,
  		Read:         memberChannel,
  		clock:        g.clock,
  		messageQueue: PriorityQueue{},
  		send:         make(chan Message),
  		close:        make(chan bool),
  	}
  	go member.listen()
  	g.members = append(g.members, member)
  	g.clockLock.Unlock()
  	g.memberLock.Unlock()
  	return member
  }
docs: // Add adds a member to the group for the provided interface channel.