Add skip-duplicate flag for robust NuGet publishing

Co-authored-by: alexwiese <[email protected]>

Fix publish workflow path for .nupkg files

Co-authored-by: alexwiese <[email protected]>

Update ALL GitHub Actions to use .NET 9.x SDK

Co-authored-by: alexwiese <[email protected]>

Update dotnetcore.yml

Update publish.yml

Update publish.yml

Update publish.yml

Merge pull request #12 from alexwiese/alexwiese-patch-3

Create dotnetcore.yml

Merge pull request #9 from alexwiese/alexwiese-patch-1

Update README.md

Merge pull request #5 from alexwiese/xml-comment

Added more comments.