Add `.gitattributes` File #359

Job	Run time
build (ubuntu-latest, Release, gcc)	6m 21s
build (ubuntu-latest, Release, clang)	5m 44s
build (ubuntu-latest, Debug, gcc)	5m 50s
build (ubuntu-latest, Debug, clang)	5m 49s
build (macos-latest, Release, gcc)	7m 6s
build (macos-latest, Release, clang)	8m 55s
build (macos-latest, Debug, gcc)	8m 7s
build (macos-latest, Debug, clang)	6m 14s
build (windows-latest, Release, cl)	6m 9s
build (windows-latest, Debug, cl)	5m 38s
	1h 5m 53s

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