I believe there are some on Content Community, but I haven't QA'd them against the latest release so can't comment on their quality or suitability.
Unfortunately, we don't have a dev guide yet but if you pick one of the simpler examples from Share itself as a starting point, you should be ok. Actually it'd be worth tracking down the Content Community examples, as these will give you a good idea of where all the files live.
Thanks,
Mike