It is best practice to include a readme file in the NuGet package.
This will also be presented on nuget.org.
The readme in the root of the repo could be reused for this.
See following around adding a readme to the package: https://devblogs.microsoft.com/nuget/add-a-readme-to-your-nuget-package/#add-a-readme-to-your-package
Currently there is not many details on nuget.org:

The readme in the project could be reused:

It is best practice to include a readme file in the NuGet package.
This will also be presented on nuget.org.
The readme in the root of the repo could be reused for this.
See following around adding a readme to the package: https://devblogs.microsoft.com/nuget/add-a-readme-to-your-nuget-package/#add-a-readme-to-your-package
Currently there is not many details on nuget.org:
The readme in the project could be reused: