Modified .csproject to emit the wwwroot/dist folder, if the folder is not created yet (#390)

Author: davidsekar

Asp2017.csproj

@@ -23,6 +23,20 @@
     <!-- Files not to publish (note that the 'dist' subfolders are re-added below) -->
     <Content Remove="ClientApp\**" />
   </ItemGroup>
+  <Target Name="DebugRunWebpack" BeforeTargets="Build" Condition=" '$(Configuration)' == 'Debug' And !Exists('wwwroot\dist') ">
+    <!-- Ensure Node.js is installed -->
+    <Exec Command="node --version" ContinueOnError="true">
+      <Output TaskParameter="ExitCode" PropertyName="ErrorCode" />
+    </Exec>
+    <Error Condition="'$(ErrorCode)' != '0'" Text="Node.js is required to build and run this project. To continue, please install Node.js from https://nodejs.org/, and then restart your command prompt or IDE." />
+
+    <!-- In development, the dist files won't exist on the first run or when cloning to
+         a different machine, so rebuild them if not already present. -->
+    <Message Importance="high" Text="Performing first-run Webpack build..." />
+    <Exec Command="npm install" />
+    <Exec Command="node node_modules/webpack/bin/webpack.js --config webpack.config.vendor.js" />
+    <Exec Command="node node_modules/webpack/bin/webpack.js" />
+  </Target>
   <Target Name="RunWebpack" AfterTargets="ComputeFilesToPublish">
     <!-- As part of publishing, ensure the JS resources are freshly built in production mode -->
     <Exec Command="npm install" />