Add computer-vision slug
Add computer-vision slug

Right now the closest thing in the list to computer vision is `science::robotics`. Computer vision algorithms are not always used for robotics. This slug also allows computer vision crates to be found easier instead of being lost among the other robotics crates.
rust-lang/crates.io,rust-lang/crates.io,rust-lang/crates.io,rust-lang/crates.io