Make `Git` automatically normalize line endings

Ref: https://git-scm.com/docs/gitattributes#_end_of_line_conversion

.editorconfig

@@ -1,5 +1,6 @@
 # For more information about the configurations used
 # in this file, please see the EditorConfig documentation:
+#
 # http://editorconfig.org
 
 root = true

.gitattributes

@@ -0,0 +1,4 @@
+# Automatically normalize line endings for all text-based files.
+# https://git-scm.com/docs/gitattributes#_end_of_line_conversion
+
+* text=auto