Translation - Vietnamese

[JaxVN]

This is the Vietnamese translation of "IoT-For-Beginners"

### Tasks
- [x] README.md
- [x] translations/README.vi.md
- [x] translations/attributions.vi.md
- [ ] translations/CODE_OF_CONDUCT.vi.md
- [ ] translations/CONTRIBUTING.vi.md
- [ ] translations/SUPPORT.vi.md
- [ ] translations/SECURITY.vi.md
- [ ] translations/TRANSLATIONS.vi.md
- [ ] translations/clean-up.vi.md
- [ ] translations/for-teachers.vi.md
- [ ] translations/hardware.vi.md
- [ ] translations/recommended-learning-model.vi.md

[JaxVN]

Just create PR #493