chore: add editorconfig

.editorconfig

@@ -0,0 +1,20 @@
+root = true
+
+[*]
+indent_style = space
+indent_size = 4
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+curly_bracket_next_line = false
+spaces_around_operators = true
+
+[*.{js,ts}]
+quote_type = double
+
+[*.{markdown,md}]
+trim_trailing_whitespace = false
+
+[*.tsv]
+indent_style = tab