It is true that you simply do not get the density of wildlife in a shade garden. With less sunshine, there is less food production and that affects all the animals up the food chain. However, beautiful and floriferous shade gardens are easily achieved and you can still attract a decent amount of wildlife. I would also say that if aesthetics are important to you, then you should place greater emphasis on leaf textures in shade gardens because the leaves in shady areas do not get burnt by the sun and look better.
A great way to landscape a shady area is to replicate a woodland garden. Many plants in our native woodlands have, in addition to great foliage, stunning flowers and berries. They include a lot of ephemeral plants, which will completely disappear on you by July. Unless you really enjoy looking at bare patches for most of the summer, it is best to mix ephemerals that flower early with plants that remain in leaf over the whole growing season.
With less emphasis of flowering perennials in a shade garden, more thought can be given to a diversity of plants that includes small trees, shrubs, ferns and sedges. Most grasses cannot handle shade, so take a look at sedges instead as these plants often have excellent value for wildlife.
The seasons to focus on in a shady garden are spring and fall. In the spring, you have shrubs that flower as well as woodland flowers. In the fall there are the asters and goldenrods that can add some flower power. By the fall, many woodland plants form berries that can add colour to this landscape.
Here is list of plants that can be grown for wildlife in the shade or in part-shade.