chore: add .editorconfig (#582)

.editorconfig

@@ -0,0 +1,17 @@
+# http://editorconfig.org
+
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+
+[*.{js,ts,vue}]
+indent_size = 4
+indent_style = space
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[*.{json,yml}]
+indent_size = 2
+indent_style = space