feat: 新增 config-provider 夜间模式偏好配置

package/document/src/document/zh-CN/guide/changelog.md

@@ -16,6 +16,7 @@
       <li> 
         <h3>1.0.2 <span class="layui-badge-rim">2022-04-07</span></h3> 
         <ul>
+          <li>[新增] config-provider 组件 dark-partial 属性, 夜间主题偏好配置。(by @就眠儀式)</li>
           <li>[修复] page 组件 pages 属性为单数时, 页码计算错误。(by @就眠儀式)</li>
           <li>[修复] dark 模式 step 组件线条不显示。(by @莫名点)</li>
         </ul> 

package/document/src/document/zh-CN/guide/dark.md

@@ -17,4 +17,40 @@
 <script setup>
 const theme = ref('dark')
 </script>
-```
+```
+
+::: title 偏好设置
+:::
+
+::: describe 当内置的夜间样式不满足要求时, 我们提供 dark-partial 配置偏好。
+:::
+
+```vue
+<template>
+    <lay-config-provider :theme="theme" :dark-partial="darkPartial">
+        <App />
+    </lay-config-provider>
+</template>
+
+<script setup>
+const theme = ref('dark')
+
+const darkPartial = {
+    brightness: 100,
+    contrast: 90,
+    grayscale: 0,
+    darkSchemeBackgroundColor: "black";
+    darkSchemeTextColor: "white";
+}
+</script>
+```
+::: describe brightness: 亮度
+:::
+::: describe contrast: 对比度
+:::
+::: describe grayscale: 灰度值
+:::
+::: describe darkSchemeBackgroundColor: 背景颜色
+:::
+::: describe darkSchemeTextColor: 文字颜色
+:::