chore: add docs

components/button/demos/basic.vue

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+<docs>
+---
+title: Basic
+---
+
+这是基础按钮
+</docs>
+
+<script lang="ts" setup></script>
+
+<template>
+  <div></div>
+</template>

components/button/index.md

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+# Button

components/button/index.zh-CN.md

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+# Button 按钮