add some additional pics

doc/md/all_components.md

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+# 支持的组件
+
+|目录|说明|备注|
+|----|----|----|
+|FluApp|初始化入口|支持路由跳转|
+|FluWindow|无边框窗口|解决windows拖动闪烁问题|
+|FluAppBar|窗口顶部标题栏|支持拖动窗口，最小化、最大化、关闭窗口|
+|FluText|Text文本||
+|FluButton|按钮||
+|FluFilledButton|实心按钮||
+|FluIconButton|图标按钮||
+|FluTextButton|文本按钮||
+|FluIcon|图标||
+|FluRadioButton|单选按钮||
+|FluTextBox|单行输入框||
+|FluMultiLineTextBox|多行输入框||
+|FluToggleSwitch|开关按钮||
+|FluSlider|拖动条||
+|FluInfoBar|提示Toast||
+|FluContentDialog|对话框||
+|FluProgressBar|条形进度条||
+|FluProgressRing|圆形进度条||
+|FluRectangle|矩形|支持部分圆角、clip|
+|FluMenu|菜单框||
+|FluTooltip|tooltip提示框||
+|FluTreeView|树控件||
+|FluTheme|主题设置|支持主题颜色切换，夜间模式|
+|FluCarousel|轮播图组件|支持无限轮播|
+|FluTimePicker|时间选择器||
+|FluDatePicker|日期选择器||
+|FluMenu|菜单Popup||
+|FluNavigationView|响应式导航布局||
+|FluScrollbar|滚动条||
+|FluToggleButton|开关按钮||
+|FluPagination|分页组件||
+|FluTableView|表格组件||
+|FluMediaPlayer|播放器||
+|FluFlipView|FlipView||

doc/preview/fluent_design.svg

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+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
+
+<!-- Uploaded to: SVG Repo, www.svgrepo.com, Transformed by: SVG Repo Mixer Tools -->
+<svg width="800px" height="800px" viewBox="0 0 73 73" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" fill="#000000" stroke="#000000">
+
+<g id="SVGRepo_bgCarrier" stroke-width="0"/>
+