Add a gitattributes file to specify LF line endings #425

Job	Run time
Test Suite (stable)	3s
Test Suite (stable, --no-default-features)	1s
Check (stable)	14s
Test Suite (ubuntu-latest)	58s
Test Suite (stable, --no-default-features --features track-caller)	1s
Test Suite	56s
Test Suite (windows-latest)	52s
Test Suite (--no-default-features)	59s
Test Suite (stable, --no-default-features --features auto-install)	1s
Test Suite (macOS-latest)	47s
Clippy (stable)	22s
Test Suite (--no-default-features --features track-caller)	58s
Test Suite (stable, --features pyo3)	1s
Test Suite (--no-default-features --features auto-install)	55s
Test Suite (stable, --all-features)	1s
Test Suite (beta)	57s
Miri	57s
Rustfmt (stable)	8s
Test Suite (beta, --no-default-features)	56s
Test Suite (beta, --no-default-features --features track-caller)	53s
Test Suite (beta, --no-default-features --features auto-install)	56s
Test Suite (beta, --features pyo3)	56s
Test Suite (beta, --all-features)	58s
Test Suite (nightly)	57s
Test Suite (nightly, --no-default-features)	8s
Test Suite (nightly, --no-default-features --features track-caller)	35s
Test Suite (nightly, --no-default-features --features auto-install)	38s
Test Suite (nightly, --features pyo3)	50s
Test Suite (nightly, --all-features)	57s
	17m 55s

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