Add download instruction (#63) #271

Job	Run time
build-linux (x86_64)	8m 39s
build-macos (x86_64)	2m 48s
build-linux (x86)	17m 29s
info	1s
build-linux (aarch64)	10m 39s
build-windows (x64)	10m 16s
build-macos (aarch64)	5m 1s
build-windows (x86)	10m 52s
build-linux (armv7)	9m 35s
sdist	12s
tests (3.8, Check Python style, isort --check tests/python/ && isort --check python/ black --chec...	4m 14s
tests (3.8, Check Rust style, rustfmt --edition 2021 src/*.rs --check )	5m 12s
tests (3.8, Lint, flake8 tests/python/ && flake8 python/ )	4m 9s
tests (3.8, Type check, mypy tests/python/ && mypy python/ )	5m 21s
tests (3.8, Test, pytest -vs --color=yes tests/python/ )	5m 32s
Release	0s
	1h 40m 0s

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