Added usage example to README and index of docs

[fpgmaas]

PR Checklist

• A description of the changes is added to the description of this PR.
• If there is a related issue, make sure it is linked to this PR.
• If you've fixed a bug or added code that should be tested, add tests!
• Documentation in docs is updated

Description of changes

I think that with the improved output formatting by @mkniewallner it would be good to show a small example of the output in the README and in the homepage of the docs, so new users know what they can expect from the tool.

[codecov]

Codecov Report

Merging #370 (4397a05) into main (e3608e5) will not change coverage.
The diff coverage is n/a.

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##            main    #370   +/-   ##
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  Coverage   96.6%   96.6%           
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  Files         37      37           
  Lines       1040    1040           
  Branches     207     207           
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  Hits        1005    1005           
  Misses        22      22           
  Partials      13      13