BlazorWasmDemoPreLoading

Just a Demo for

##1 how to preload the resources for Blazor WebAssembly app

or

##2 how to show a loading page before Enter Blazor WebAssembly app

What file changed :

1 - BlazorWasmDemoPreLoading.Server/Pages/Index.cshtml

2 - BlazorWasmDemoPreLoading.Client/Shared/NavMenu.razor

3 - BlazorWasmDemoPreLoading.Client/Pages/Index.razor