Provide Microsoft.AspNetCore.Components.WebAssembly.Server package README (#57774)

Author: MackinnonBuck

src/Components/WebAssembly/Server/src/PACKAGE.md

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+## About
+
+`Microsoft.AspNetCore.Components.WebAssembly.Server` provides runtime server features for ASP.NET Core Blazor applications that have a client running under WebAssembly.
+
+## Key Features
+
+* Provides the ability to statically render components that utilize WebAssembly interactivity
+* Enables debugging functionality for code running in WebAssembly
+* Allows serialization and transmission of server-side authentication state for use during WebAssembly interactivity
+
+## How to Use
+
+To use `Microsoft.AspNetCore.Components.WebAssembly.Server`, follow these steps:
+
+### Installation
+
+```shell
+dotnet add package Microsoft.AspNetCore.Components.WebAssembly.Server
+```
+
+### Configuration
+
+To enable WebAssembly interactivity in a Blazor Web app, configure it in your app's `Program.cs`:
+
+```csharp
+builder.Services.AddRazorComponents()
+    .AddInteractiveWebAssemblyComponents();
+
+var app = builder.Build();
+
+if (app.Environment.IsDevelopment())
+{
+    app.UseWebAssemblyDebugging();
+}
+
+app.UseAntiforgery();
+app.MapStaticAssets();
+app.MapRazorComponents<App>()
+    .AddInteractiveWebAssemblyRenderMode()
+    .AddAdditionalAssemblies(typeof(BlazorWebApp.Client._Imports).Assembly);
+```
+
+Make sure to update the call to `AddAdditionalAssemblies` with any client assemblies that should be included in the Blazor application.
+
+## Main Types
+
+The main types provided by this package are:
+
+* `WebAssemblyComponentsEndpointOptions`: Provides options for configuring interactive WebAssembly components
+* `AuthenticationStateSerializationOptions`: Provides options for configuring the JSON serialization of the `AuthenticationState` to the WebAssembly client
+
+## Additional Documentation
+
+For additional documentation and examples, refer to the [official documentation](https://learn.microsoft.com/aspnet/core/blazor) on Blazor.
+
+## Feedback &amp; Contributing
+
+`Microsoft.AspNetCore.Components.WebAssembly.Server` is released as open-source under the [MIT license](https://licenses.nuget.org/MIT). Bug reports and contributions are welcome at [the GitHub repository](https://github.com/dotnet/aspnetcore).