chore(Skeleton): new component

docs/components/content/examples/SkeletonExample.vue

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+<template>
+  <div class="flex items-center space-x-4">
+    <USkeleton class="h-12 w-12" :ui="{ rounded: 'rounded-full' }" />
+    <div class="space-y-2">
+      <USkeleton class="h-4 w-[250px]" />
+      <USkeleton class="h-4 w-[200px]" />
+    </div>
+  </div>
+</template>

docs/content/6.layout/3.skeleton.md

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+---
+github: true
+---
+
+## Usage
+
+Use to show a placeholder while content is loading.
+
+::component-example
+#default
+:skeleton-example
+
+#code
+```vue
+<template>
+  <div className="flex items-center space-x-4">
+    <USkeleton class="h-12 w-12 rounded-full" />
+    <div className="space-y-2">
+      <USkeleton class="h-4 w-[250px]" />
+      <USkeleton class="h-4 w-[200px]" />
+    </div>
+  </div>
+</template>
+```
+::
+
+## Props
+
+:component-props
+
+## Preset
+
+:component-preset