[pt-BR] Add file novice/git/00-intro.md based on 5c1b655
[pt-BR] Full translation of novice/git/00-intro.md based on 5c1b655
[pt-BR] Add file novice/git/01-backup.md based on eed8217
[pt-BR] Translate part of novice/git/01-backup.md based on eed8217