I want to contribute something to jieshuo

[NVCDevelopmentTeam]

Hi, I have contributed my translation for Vietnamese language, although it is not perfect and excellent, it is 90% satisfactory and it will be edited by the community in the future. Thank you for your product and I hope, my contributions will help the application develop more. However, I hope you can add the In-App Purchase feature so that the app can be posted on the play store. In addition, it will make it easier for anyone to buy the full version without having to pay through manual transactions. Thank you for always trusting me. I hope it will be improved in the near future.