i dont know if it would be breaching, as it would also be advertising for them... kinda cancils each other out i reckon. but maybe double check with someone else lol to be safe.
I don't think you would get into any trouble for it. Plus they won't sue you right away if they don't like it they will probably email your or give you a pm telling you to take it off. ( yes people from jagex can view this site and they can create an account on this site even if people say they can't)