B2B-88: add starter kit structure and elements

packages/ui/src/shadcn/skeleton.tsx

@@ -0,0 +1,15 @@
+import { cn } from '../lib/utils';
+
+function Skeleton({
+  className,
+  ...props
+}: React.HTMLAttributes<HTMLDivElement>) {
+  return (
+    <div
+      className={cn('bg-primary/10 animate-pulse rounded-md', className)}
+      {...props}
+    />
+  );
+}
+
+export { Skeleton };