Add scroll-view

Author: xcatliu

src/_scroll-view.scss

@@ -0,0 +1,4 @@
+.scroll-view {
+  overflow: auto;
+  -webkit-overflow-scrolling: touch;
+}

src/index.scss

@@ -1,4 +1,5 @@
 @import "container";
 @import "flexbox";
 @import "top-gap";
+@import "scroll-view";
 @import "show-hide-on-mobile";