docs: write down a tutorial following diataxis guidelines

[matthiasschaub]

• Explain files created? -> docs(tutorial): Explain the parquet files a bit more #36
• Do a fun little analysis -> docs(tutorial): Do a fun little analysis #37
• Link to queries
• Add a note or a faq explaining --parallel: The number of threads (--parallel parameter) defines the number of files which will be created. -> docs(faq): explain --parallel option #38

https://diataxis.fr/tutorials/#the-language-of-tutorials

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[rtroilo]

Thank you! 🚀