[新增] dropdown 下拉菜单

docs/docs/zh-CN/components/dropdown.md

@@ -1,7 +1,41 @@
 ::: demo
 
 <template>
-  <lay-dropdown></lay-dropdown>
+  <lay-dropdown>
+    <lay-button>下拉菜单</lay-button>
+    <template #content>
+    </template>
+  </lay-dropdown>
+</template>
+
+<script>
+import { ref } from 'vue'
+
+export default {
+  setup() {
+
+    return {
+    }
+  }
+}
+</script>
+
+:::
+
+::: demo
+
+<template>
+  <lay-dropdown>
+    <lay-button>Hover 触发</lay-button>
+    <template #content>
+    </template>
+  </lay-dropdown>
+  &nbsp;&nbsp;
+    <lay-dropdown>
+    <lay-button>Click 触发</lay-button>
+    <template #content>
+    </template>
+  </lay-dropdown>
 </template>
 
 <script>