I think the main problem with a pond in the shade is that the lack of sunlight restricts the growth of oxygenating plants, the resulting lack of oxygen in the water causes stagnation, and you end up with nothing living in the pond except bloodworms and mosquitoe larvae.
I believe that this can be avoided with the right plants, but a shady pond will never support the same diversity as a sunny pond, and I dont actually know what plants to suggest. You could try various oxygenating plants to see if any do OK, but in the long term I think you might find a damp fern bed is a more practical option, and looks more natural in the shade.
HTH
Tursiops2
PS, I forgot... welcome to the forum
