Add a chapter about errors

One concept that I still find quite hard to grasp are Nushell's errors.
As far as I can tell, they behave like raised exceptions in a language like Python.
They bubble up, but can be caught with try or do -i.
However, I haven't seen that spelled out yet.

I see that nushell errors are also created if external commands exit with a non-zero exit code.
But also that isn't mentioned in the book.

I would be happy to add a chapter about errors in Nushell if someone could me guide through the things I am unsure about.

Topics to cover:

• behavior of errors
• try
• do
• error make
• complete

Aucun fichier, test ou point d’entrée n’est indiqué dans l’issue. Commencez par consulter la documentation de Nushell sur les erreurs, try, do -i, error make et complete, puis confirmez le comportement des codes de sortie externes non nuls ; le travail sera terminé lorsqu’un chapitre expliquant clairement chacun des sujets listés aura été ajouté.