add basic vite setup

demos/preview/index.vue

@@ -0,0 +1,10 @@
+<template>
+  <ul v-if="$route.path === '/'">
+    <li v-for="route in $router.options.routes" :key="route.path">
+      <router-link :to="route.path">
+        {{ route.path }}
+      </router-link>
+    </li>
+  </ul>
+  <router-view v-else />
+</template>