chore: setup compodium in playground

playground/compodium/examples/UButtonExampleSizes.vue

@@ -0,0 +1,13 @@
+<script setup lang="ts">
+extendCompodiumMeta({
+  combo: ['variant', 'size'],
+  defaultProps: {
+    label: 'Click me!',
+    disabled: true
+  }
+})
+</script>
+
+<template>
+  <UButton v-bind="$attrs" />
+</template>