Better "how to run samples" instructions needed for Authentication samples

Instructions on how to run the samples are very sparse, and after trying a few things I never could. I had cloned the entire aspnetcore repo and tried to run and example from src\Security\samples:
`dotnet run --project DynamicSchemes`

that build failed due to missing nuget packages. had to
`dotnet restore ..\..\eng\tools\RepoTasks`

Now build just fails
`C:\Program Files\dotnet\sdk\5.0.202\Microsoft.Common.CurrentVersion.targets(4919,5): error MSB3030: Could not copy the file "C:\Development\aspnetcore\artifacts\bin\InProcessRequestHandler\Win32\Debug\aspnetcorev2_inprocess.dll" because it was not found. [C:\Development\aspnetcore\src\Servers\IIS\IIS\src\Microsoft.AspNetCore.Server.IIS.csproj]
`
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#### Document Details

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* ID: 82950389-524e-0754-a125-addeccbdb1b3
* Version Independent ID: 80b7f7cf-dc2e-137a-5aa7-fa88da63ac80
* Content: [Authentication samples for ASP.NET Core](https://docs.microsoft.com/en-us/aspnet/core/security/authentication/samples?view=aspnetcore-5.0)
* Content Source: [aspnetcore/security/authentication/samples.md](https://github.com/dotnet/AspNetCore.Docs/blob/main/aspnetcore/security/authentication/samples.md)
* Product: **aspnet-core**
* Technology: **aspnetcore-security**
* GitHub Login: @Rick-Anderson
* Microsoft Alias: **riande**