feat: publicize doc implemetation

one/docs/demo/uploader/validate.vue

@@ -0,0 +1,53 @@
+<template>
+<article>
+  <section>
+    <veui-uploader
+      v-model="images"
+      type="image"
+      action="https://app.fakejson.com/q/ELymQ7xh?token=AWFkjMICPSAB_bO_z-Lnog"
+      accept="jpg,png"
+      :max-count="6"
+      max-size="100kb"
+      :validator="validator"
+    >
+      <template #desc>
+        请选择jpg、png图片，大小不超过100kb，宽高分别大于200px，最多上传6张图片
+      </template>
+    </veui-uploader>
+  </section>
+</article>
+</template>
+
+<script>
+import { Uploader } from 'veui'
+
+export default {
+  components: {
+    'veui-uploader': Uploader
+  },
+  data () {
+    return {
+      images: [
+        {
+          src: '/images/development/uploader/demo-image1.jpg'
+        },
+        {
+          src: '/images/development/uploader/demo-image2.jpg'
+        }
+      ],
+      validator (file) {
+        return new Promise(resolve => {
+          let image = new Image()
+          image.src = window.URL.createObjectURL(file)
+          image.onload = () => {
+            resolve({
+              valid: image.height > 200 && image.width > 200,
+              message: '图片宽高太小'
+            })
+          }
+        })
+      }
+    }
+  }
+}
+</script>