Create .gitattributes

.gitattributes

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+# Declare files that will always have LF line endings on checkout.
+*.cpp text eol=lf
+*.h text eol=lf
+*.c text eol=lf
+*.hpp text eol=lf
+*.txt text eol=lf
+*.cmake text eol=lf
+*.sh text eol=lf