Add an old CLEED example

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (c716f6e) 100.00% compared to head (ba07488) 100.00%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #30 +/- ## ========================================= Coverage 100.00% 100.00% ========================================= Files 5 5 Lines 22 22 ========================================= Hits 22 22 ``` | [Flag](https://app.codecov.io/gh/empa-scientific-it/cleedpy/pull/30/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=empa-scientific-it) | Coverage Δ | | |---|---|---| | [python-3.10](https://app.codecov.io/gh/empa-scientific-it/cleedpy/pull/30/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=empa-scientific-it) | `100.00% <ø> (ø)` | | | [python-3.11](https://app.codecov.io/gh/empa-scientific-it/cleedpy/pull/30/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=empa-scientific-it) | `100.00% <ø> (ø)` | | | [python-3.12](https://app.codecov.io/gh/empa-scientific-it/cleedpy/pull/30/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=empa-scientific-it) | `100.00% <ø> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=empa-scientific-it#carryforward-flags-in-the-pull-request-comment) to find out more.

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[baffelli]

Looks good. We need an example for CSEARCH parameters as well. Or rather specifications, since we will write the search ourselves.