just wondering since the sith and jedi have codes

do the revinites have one?

I wouldn't call it code but I suspect that their teachings all fall in line with what Revan believed in and what he stood for. Like for example how he was both Sith and Jedi or how he used his companions traits to get his goals accomplished.

Sadly no, they are a wildly disparate group, some of whom don't have anything in common except a reverence of Revan and a disapproval of the current system. They compose of both darksiders and lightsiders, a common code that they all follow is pretty much impossible, although several seem to believe in a balanced way of life, which might be considered "Grey" by those who want to.