docs: add pytorch integration guide. #398

Job	Run time
Cargo Machete	1m 2s
pre-commit	42s
determine changes	11s
build binary \| linux x86_64	4m 57s
build binary \| windows aarch64	9m 37s
build binary \| macos aarch64	4m 6s
build binary \| macos x86_64	0s
build binary \| windows x86_64	9m 3s
cargo test \| ubuntu	6m 5s
cargo test \| macos aarch64	6m 47s
cargo test \| macos x86_64	0s
cargo test \| windows	8m 25s
cargo rustdoc \| ubuntu	3m 47s
cargo fmt \| ubuntu	15s
cargo clippy \| ubuntu	50s
pytest integration \| macos aarch64	4m 37s
test wheel installation \| macos aarch64 / Test Installation of Common Wheels \| macos-aarch64	1m 33s
pytest integration \| linux x86_64	9m 56s
test wheel installation \| linux x86_64 / Test Installation of Common Wheels \| linux-x86_64	1m 55s
pytest integration \| windows x86_64	13m 16s
test wheel installation \| windows x86_64 / Test Installation of Common Wheels \| windows-x86_64	2m 55s
	1h 29m 59s

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