I work for a university in an office which is a converted terraced house; at the back of the building is a small, walled garden. It doesn't get a lot of light as we're in the middle of back-to-back terraces, and there are neighbouring trees which provide a lot of shade. The garden is currently gravelled (lots of weeds poking up), and there's a medium-sized tree in the middle. Apart from some neglected pot plants and some ivy, there's not a lot growing. The university may be able to help getting the weeds cleared, but I don't think they really do regular gardening services. Any plants/equipment would have to come from my money, though.
No-one really uses the garden, and I haven't seen much wildlife in there apart from the odd magpie. Since it's barely used I'd like to make it a bit more wildlife friendly, but I know very little about gardening, and I don't really know where to start. I was going to put some bird feeders in the tree, but what else can I do?