docs: add pytorch integration guide. #338

Job	Run time
determine changes	9s
pre-commit	37s
Cargo Machete	1m 3s
cargo clippy \| ubuntu	47s
cargo fmt \| ubuntu	16s
cargo test \| macos aarch64	5m 39s
cargo test \| ubuntu	5m 39s
cargo rustdoc \| ubuntu	1m 4s
build binary \| linux x86_64	2m 36s
build binary \| windows aarch64	4m 14s
build binary \| macos aarch64	3m 26s
build binary \| windows x86_64	3m 49s
cargo test \| macos x86_64	0s
build binary \| macos x86_64	0s
cargo test \| windows	4m 42s
pytest integration \| linux x86_64	2m 55s
test wheel installation \| linux x86_64 / Test Installation of Common Wheels \| linux-x86_64	1m 54s
pytest integration \| windows x86_64	1m 46s
test wheel installation \| windows x86_64 / Test Installation of Common Wheels \| windows-x86_64	1m 42s
pytest integration \| macos aarch64	55s
test wheel installation \| macos aarch64 / Test Installation of Common Wheels \| macos-aarch64	56s
	44m 9s

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