Method addUser

java/Chapter 8/Question8_7/UserManager.java:20–25

(User fromUser, String toAccountName)

	}
	
	public void addUser(User fromUser, String toAccountName) {
		User toUser = usersByAccountName.get(toAccountName);
		AddRequest req = new AddRequest(fromUser, toUser, new Date());
		toUser.receivedAddRequest(req);
		fromUser.sentAddRequest(req);
	}
	
	public void approveAddRequest(AddRequest req) {
		req.status = RequestStatus.Accepted;