My "Thank You" offering to you

I'm loving the System.CommandLine package, and I've teaching it for the first time in my Programming Fundamentals class (post-secondary). **Thank You!**

I'm building up a good tutorial for absolute beginners to use. Here's a PDF of one of my documents that I thought I would share with you (and the community).

[Specs-Day-3.pdf](https://github.com/dotnet/command-line-api/files/10112219/Specs-Day-3.pdf)

p.s. - If you like my work and think it can be helpful on Microsoft Learn or some other place, I'm quite happy to share. Just let me know what you would need for me to contribute. *Thanks again!*

Start by reviewing the linked Specs-Day-3.pdf to understand the tutorial content and its relationship to System.CommandLine. The issue does not identify a documentation location or a concrete change; done would require maintainers to define whether and where this material should be incorporated.

Vom Indexierungsmodell aus dem Issue-Text verfasst.