docs: add pytorch integration guide. #310

Job	Run time
Cargo Machete	1m 1s
determine changes	7s
pre-commit	45s
build binary \| linux x86_64	2m 8s
build binary \| windows aarch64	3m 44s
build binary \| macos x86_64	0s
build binary \| macos aarch64	2m 56s
build binary \| windows x86_64	4m 6s
cargo test \| ubuntu	4m 26s
cargo test \| macos aarch64	4m 46s
cargo test \| macos x86_64	0s
cargo test \| windows	8m 39s
cargo rustdoc \| ubuntu	1m 2s
cargo fmt \| ubuntu	19s
cargo clippy \| ubuntu	45s
pytest integration \| linux x86_64	8m 50s
test wheel installation \| linux x86_64 / Test Installation of Common Wheels \| linux-x86_64	1m 49s
pytest integration \| macos aarch64	4m 1s
test wheel installation \| macos aarch64 / Test Installation of Common Wheels \| macos-aarch64	1m 54s
pytest integration \| windows x86_64	5m 3s
test wheel installation \| windows x86_64 / Test Installation of Common Wheels \| windows-x86_64	3m 3s
	59m 24s

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