The examples were found by
```bash
$ find . -not -path '*/\.*' -type d '!' -exec test -e "{}/README.md" ';' -print
```
To do so, a cleanup-script .meta/add_readme.py was created.
The commands
find . -type f -name '*.md' -exec sed --in-place 's/[[:space:]]\+$//' {} \+
and
find . -type f -name '*.tex' -exec sed --in-place 's/[[:space:]]\+$//' {} \+
were used to do so.