Updated italian translation
Created by: hrumag
Updated italian translation - Main Page Added italian translation - contribute.md (https://taiga.getmonero.org/project/erciccione-monero-localization/task/159) Added italian translation -faq.md (https://taiga.getmonero.org/project/erciccione-monero-localization/task/161 Added italian translation - accepting.md (https://taiga.getmonero.org/project/erciccione-monero-localization/task/160)