doc: add reference to recommended cli frameworks

Author: jannismain

docs/user-guide/topics/cli.md

@@ -1 +1,18 @@
 # CLI
+
+A CLI (or command line interface) is a type of script you can run in the terminal.
+
+## Frameworks
+
+While frameworks are not required to implement a CLI in Python, they might provide a better structure and useful utilities which make them worth exploring:
+
+- [click]
+- [typer]: based on click, integrates with type annotations
+
+## References
+
+There is a section on [Python CLIs](https://intern.iis.fhg.de/x/IeVsBg) in the [IIS Knowledge Base][].
+
+[iis knowledge base]: https://s.fhg.de/iis-kb
+[click]: https://click.palletsprojects.com/
+[typer]: https://typer.tiangolo.com/