Simply create a rust project using cargo init . --name <assignment-name> and copy the Makefile into the project folder.
Finally, copy grnvs.rs into src/.
In order to use the Makefile, adjust the CRATE_NAME variable in the first line.
Before building locally, run export ONLINE=1 in your shell to signal to make that you are running online.
Before commiting, run make common/cargo_deps.tar.gz and commit common/ and .cargo, too.
This will package all your crates and ship them to the tester.
Remove both directorys before continuing to work locally, cargo will fail otherwise.