Method addConversation

java/Chapter 8/Question8_7/User.java:87–90

(PrivateChat conversation)

	}
	
	public void addConversation(PrivateChat conversation) {
		User otherUser = conversation.getOtherParticipant(this);
		privateChats.put(otherUser.getId(), conversation);
	}

	public void addConversation(GroupChat conversation) {
		groupChats.add(conversation);