update,

twcsum/.editorconfig

@@ -0,0 +1,14 @@
+root = true
+
+[*]
+charset = utf-8
+indent_style = space
+indent_size = 2
+end_of_line = lf
+trim_trailing_whitespace = true
+insert_final_newline = true
+max_line_length = 120
+
+[*.md]
+indent_size = 2
+trim_trailing_whitespace = true