Add .editorconfig

.editorconfig

@@ -0,0 +1,17 @@
+# For more information about the properties used in
+# this file, please see the EditorConfig documentation:
+# http://editorconfig.org/
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+indent_size = 4
+indent_style = tab
+insert_final_newline = true
+trim_trailing_whitespace = true
+spaces_around_brackets = outside
+
+[*.md]
+trim_trailing_whitespace = false
+indent_style = space