add OrderCoupon component

packages/vant-css/src/index.css

@@ -1,40 +1,51 @@
 /**
-  css组件库入口，组装成css组件库
+ * style entry
  */
+
+/* base */
 @import './reset.css';
+
+/* common components */
+@import './col.css';
+@import './row.css';
+@import './badge.css';
 @import './button.css';
 @import './cell.css';
 @import './cell-swipe.css';
 @import './card.css';
-@import './deep-select.css';
-@import './dialog.css';
-@import './field.css';
 @import './icon.css';
 @import './loading.css';
-@import './picker.css';
 @import './popup.css';
-@import './radio.css';
-@import './switch.css';
-@import './badge.css';
 @import './search.css';
 @import './panel.css';
 @import './steps.css';
 @import './tag.css';
-@import './checkbox.css';
 @import './tab.css';
-@import './col.css';
-@import './row.css';
 @import './image-preview.css';
-@import './actionsheet.css';
 @import './quantity.css';
 @import './progress.css';
-@import './toast.css';
-@import './uploader.css';
 @import './swipe.css';
-@import './notice-bar.css';
-@import './switch-cell.css';
+
+/* form components */
+@import './checkbox.css';
+@import './field.css';
+@import './radio.css';
+@import './switch.css';
+@import './uploader.css';
+
+/* action components */
+@import './actionsheet.css';
+@import './dialog.css';
+@import './picker.css';
+@import './toast.css';
+
+/* business components */
+@import './deep-select.css';
 @import './express-way.css';
-@import './pay-order.css';
-@import './order-goods.css';
-@import './invalid-goods.css';
 @import './goods-action.css';
+@import './invalid-goods.css';
+@import './notice-bar.css';
+@import './order-coupon.css';
+@import './order-goods.css';
+@import './pay-order.css';
+@import './switch-cell.css';