Add more examples

I'm reworking our TODO app and figured we need more end-to-end examples.

Here is a lis for inspiration (will update with more):

- https://github.com/ktorio/ktor-samples

The issue names no file, test, or entry point; begin by locating the repository's existing end-to-end examples and comparing their structure with the linked Ktor samples. Done means adding agreed, runnable examples for the TODO app, but the issue does not define which examples or where they belong.

Written by the indexing model from the issue text.