feat: publicize doc implemetation

one/docs/demo/select/size.vue

@@ -0,0 +1,59 @@
+<template>
+<article>
+  <veui-select
+    v-model="license"
+    ui="l"
+    :options="options"
+  />
+  <veui-select
+    v-model="license"
+    :options="options"
+  />
+  <veui-select
+    v-model="license"
+    ui="s"
+    :options="options"
+  />
+  <veui-select
+    v-model="license"
+    ui="xs"
+    :options="options"
+  />
+</article>
+</template>
+
+<script>
+import { Select } from 'veui'
+
+export default {
+  components: {
+    'veui-select': Select
+  },
+  data () {
+    return {
+      license: null,
+      options: [
+        {
+          label: 'MIT',
+          value: 'mit'
+        },
+        {
+          label: 'BSD',
+          value: 'bsd'
+        },
+        {
+          label: 'Apache 2.0',
+          value: 'apache2'
+        }
+      ]
+    }
+  }
+}
+</script>
+
+<style lang="less" scoped docs>
+.veui-select {
+  max-width: 120px;
+  margin-right: 10px;
+}
+</style>