doc: 增加依赖说明文档

Author: ArgoZhang

src/BootstrapBlazor.Server/Components/Samples/PdfReaders.razor

@@ -7,6 +7,8 @@
 <PackageTips Name="BootstrapBlazor.PdfReader" />
 
 <DemoBlock Title="@Localizer["PdfReaderNormalText"]" Introduction="@Localizer["PdfReaderNormalIntro"]" Name="Normal">
+    <p>@((MarkupString)Localizer["PdfReaderFAIconDesc"].Value)</p>
+    <Pre>&lt;link rel="stylesheet" href="@@Assets["_content/BootstrapBlazor.FontAwesome/css/font-awesome.min.css"]" /&gt;</Pre>
     <ul class="ul-demo">
         <li>@((MarkupString)Localizer["PdfReaderSetPdfStreamDesc"].Value)</li>
         <li>@((MarkupString)Localizer["PdfReaderDownloadFileNameDesc"].Value)</li>

src/BootstrapBlazor.Server/Locales/en-US.json

@@ -5965,6 +5965,7 @@
     "PdfIntro": "Embed and display PDF documents directly in web pages without relying on a PDF reader installed locally by the user.",
     "PdfReaderNormalText": "Basic usage",
     "PdfReaderNormalIntro": "Set the PDF file address using the <code>Url</code> parameter, or specify the file stream to be rendered using the <code>OnGetStreamAsync</code> parameter.",
+    "PdfReaderFAIconDesc": "The <code>PdfReader</code> component icon depends on the `BootstrapBlazor.FontAwesome` package. You need to reference the following styles; otherwise, the toolbar icon will not display.",
     "PdfReaderSetPdfStreamDesc": "Rendering can be performed by calling the instance method <code>SetPdfStreamAsync</code>  <code>SetPdfBase64DataAsync</code>.",
     "PdfReaderDownloadFileNameDesc": "Can set the download file name by configuring the parameter <code>DownloadFileName</code>.",
     "PdfReaderStreamModeText": "Stream mode",

src/BootstrapBlazor.Server/Locales/zh-CN.json

@@ -5965,6 +5965,7 @@
     "PdfIntro": "在网页中直接嵌入和显示 PDF 文档，无需依赖用户本地安装的 PDF 阅读器",
     "PdfReaderNormalText": "基础用法",
     "PdfReaderNormalIntro": "通过 <code>Url</code> 参数设置 pdf 文件地址，或者使用 <code>OnGetStreamAsync</code> 参数指定用于渲染的文件流",
+    "PdfReaderFAIconDesc": "<code>PdfReader</code> 组件图标依赖 <code>BootstrapBlazor.FontAwesome</code> 包，需要引用如下样式，否则工具栏图标无法显示",
     "PdfReaderSetPdfStreamDesc": "可以通过调用实例方法 <code>SetPdfStreamAsync</code> <code>SetPdfBase64DataAsync</code> 推流进行渲染",
     "PdfReaderDownloadFileNameDesc": "可以通过设置参数 <code>DownloadFileName</code> 值，用于设置下载文件名",
     "PdfReaderStreamModeText": "流模式",