Login/Logout link

Hi;

I want to add a login/logout link to my main navigation - wondering what is the best way to approach this:

I’m using wayfinder to build the menus, I was thinking I just wanted a menu item that says login for anonymous users and once a user logs in I wanted it to change to logout...

I thought I could do this with resource groups, but apparently there is a lot of extra setup there - is there a more efficient way of doing this?

-thanks
-sean