add playlist file to project

MediaBrowser.WebDashboard/MediaBrowser.WebDashboard.csproj

@@ -204,6 +204,9 @@
     <Content Include="dashboard-ui\musicrecommended.html">
       <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
     </Content>
+    <Content Include="dashboard-ui\playlist.html">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </Content>
     <Content Include="dashboard-ui\scripts\boxset.js">
       <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
     </Content>