feat: publicize doc implemetation

one/docs/demo/directives/drag/base.vue

@@ -0,0 +1,28 @@
+<template>
+<article>
+  <div
+    ref="target"
+    v-drag:target.translate
+    class="target"
+  />
+</article>
+</template>
+
+<script>
+import drag from 'veui/directives/drag'
+
+export default {
+  directives: {
+    drag
+  }
+}
+</script>
+
+<style lang="less" scoped docs>
+@import "~veui-theme-dls/lib.less";
+
+.target {
+  .size(80px);
+  background: @veui-gray-color-6;
+}
+</style>