There is a wiki, but I don't think it's being updated much. Maybe that'll change as the game develops more! http://wiki.diceydungeons.com/index.php?title=Dicey_Dungeons
As a game that's still in alpha, I'm still figuring a lot of stuff out, and it's felt a little premature to start working on that particular kind of polish - I'd like to finalise the rules before I start tutorialising it! However, with the final character now in place, I'm hoping to start making some progress on that in upcoming versions. Rest assured that this is an issue I'm thinking about, and hope to have solved by v1.0!