IDE0073: Require file header

[h3xds1nz]

More info: https://learn.microsoft.com/en-us/dotnet/fundamentals/code-analysis/style-rules/ide0073

[robert-abeo]

Most projects have moved away from headers. They just get out of date and clutter things up. A license and docs in the repo root is just as legally binding.

[h3xds1nz]

It is what is it, dotnet/runtime follows this pattern as do other Microsoft repos and I personally like them :)

[miloush]

When a file is reused in another project, it is good to see where it comes from.