Add to godbolt

[LegNeato]

It would be great to have rust-cuda on https://godbolt.org/.

The repo is here:

https://github.com/compiler-explorer/compiler-explorer

[LegNeato]

Good thing there are already GPU nodes and CUDA is already installed on godbolt:

https://github.com/compiler-explorer/infra/blob/ea4f53cee764f319d03bdd1a3a7bde27b94bb4a6/setup-gpu-node.sh#L10

https://github.com/compiler-explorer/infra/blob/ea4f53cee764f319d03bdd1a3a7bde27b94bb4a6/update_compilers/install_nonfree_compilers.sh#L105