doc: translated example code

[gekkedev]

• not sure if I translated Jen correctly as "jeans"
• Yarn installation example added since it is a fairly common package manager

[gekkedev]

@icleitoncosta could you check? It's just some translations

[icleitoncosta]

Very good, in the next commits, please send commit name with "docs: text......" for docs ou "fix: text..." for texts, for not have error of lint

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[gekkedev]

Thanks for the hint, so even if we squash-merge (hopefully^^) there will be conventional commit checks? I'll keep that in mind for future commits.