Add ASP.NET Web App Core support

Please, in the documentation add the support for ASP.NET Web App Core in Framework Guides. I tried it and works good.

Step 1.
Run this comand in the project folder.

npm install tailwindcss @tailwindcss/cli

Step 2.
In wwwroot/css/site.css add this row in the first line.

@import "http://github.com/tailwindcss";

Step 3.
Edit the package.json file and paste it after dependencies.

"scripts": {
  "tailwindcss:build": "npx @tailwindcss/cli -i ./wwwroot/css/site.css -o ./wwwroot/css/tailwind.css"
}

Step 4.
Edit the .csproj file and add this.

<Target Name="Build Tailwind CSS" BeforeTargets="Build">
  <Exec Command="npm run tailwindcss:build"/>
</Target>

Step 5.
In the _Layout.cshtml file add the reference of Tailwind.

<link rel="stylesheet" href="http://github.com/~/css/tailwind.css" asp-append-version="true" />

Step 6.
Build and try.

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