docs: add pytorch integration guide. #295

Job	Run time
determine changes	8s
pre-commit	38s
Cargo Machete	1m 2s
build binary \| linux x86_64	2m 13s
build binary \| macos x86_64	0s
build binary \| macos aarch64	3m 43s
build binary \| windows x86_64	3m 51s
build binary \| windows aarch64	4m 18s
cargo test \| macos aarch64	4m 25s
cargo test \| ubuntu	4m 41s
cargo test \| macos x86_64	0s
cargo test \| windows	7m 18s
cargo rustdoc \| ubuntu	56s
cargo fmt \| ubuntu	16s
cargo clippy \| ubuntu	42s
pytest integration \| linux x86_64	8m 57s
test wheel installation \| linux x86_64 / Test Installation of Common Wheels \| linux-x86_64	1m 52s
pytest integration \| macos aarch64	5m 5s
test wheel installation \| macos aarch64 / Test Installation of Common Wheels \| macos-aarch64	2m 2s
pytest integration \| windows x86_64	10m 27s
test wheel installation \| windows x86_64 / Test Installation of Common Wheels \| windows-x86_64	2m 55s
	1h 5m 29s

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