Support dotnet 6

[Wenfengcheng]

PS D:\DataWenfeng\XXXX> dotnet tool install --global dotnet-document --version 0.1.4-alpha
You can invoke the tool using the following command: dotnet-document
Tool 'dotnet-document' (version '0.1.4-alpha') was successfully installed.

PS D:\DataWenfeng\XXXX> dotnet document apply
You must install or update .NET to run this application.

App: C:\Users\wenfeng\.dotnet\tools\dotnet-document.exe
Architecture: x64
Framework: 'Microsoft.NETCore.App', version '5.0.0' (x64)
.NET location: C:\Program Files\dotnet\

The following frameworks were found:
  6.0.6 at [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  6.0.7 at [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]

Learn about framework resolution:
https://aka.ms/dotnet/app-launch-failed

To install missing framework, download:
https://aka.ms/dotnet-core-applaunch?framework=Microsoft.NETCore.App&framework_version=5.0.0&arch=x64&rid=win10-x64