Add PWA support

Author: ChristopherHaws

samples/wasm/Sample.Wasm.csproj

@@ -5,7 +5,8 @@
     <IsPackable>false</IsPackable>
     <NoWarn>$(NoWarn);CA2007</NoWarn>
     <GHPages>true</GHPages>
-    <GHPagesBase>https://blazorstack.dev</GHPagesBase>
+    <GHPagesBase>$(PackageProjectUrl)</GHPagesBase>
+    <ServiceWorkerAssetsManifest>service-worker-assets.js</ServiceWorkerAssetsManifest>
 	</PropertyGroup>
 
 	<ItemGroup>
@@ -18,5 +19,9 @@
 	  <ProjectReference Include="..\sample\Sample.csproj" />
 	</ItemGroup>
 
+  <ItemGroup>
+    <ServiceWorker Include="wwwroot\service-worker.js" PublishedContent="wwwroot\service-worker.published.js" />
+  </ItemGroup>
+
 
 </Project>

samples/wasm/wwwroot/index.html

@@ -6,6 +6,8 @@
     <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no" />
     <title>BlazorStack</title>
     <base href="/" />
+	<link href="manifest.json" rel="manifest" />
+	<link rel="apple-touch-icon" sizes="512x512" href="icon-512.png" />
     <link href="https://fonts.googleapis.com/css?family=Roboto:300,400,500,700&display=swap" rel="stylesheet" />
     <link href="_content/MudBlazor/MudBlazor.min.css" rel="stylesheet" />
 </head>
@@ -31,6 +33,7 @@ <h1>BlazorStack Demo</h1>
     </div>
     <script src="_framework/blazor.webassembly.js"></script>
     <script src="_content/MudBlazor/MudBlazor.min.js"></script>
+	<script>navigator.serviceWorker.register('service-worker.js');</script>
 </body>
 
 </html>