Added a pointer from the module-level cargo docs to the actual docs on `rapier.rs` so other people won't be lost like I was.
(Searches for documentation often end up on `docs.rs`, which is not where most of Rapier's docs live. The README has a pointer to the docs, but it isn't as visible once you're on `docs.rs`.)
This is the same change as pr89 for `bevy_rapier`. This one is less important less likely to overlook `rapier.rs`, but I think it doesn't hurt.
Ideally you'd be able to just include the `README.md` into the lib documentation, but I think that's still a nightly-only feature in cargo doc.
This adds a QueryPipeline structure responsible for scene queries.
Currently this structure is able to perform a brute-force ray-cast.
This commit also includes the beginning of implementation of a SIMD-based acceleration structure which will be used for these scene queries in the future.
