Enables Vietnamese number key based
vnikey is a tool for typing Vietnamese, similar to other libraries as HIM, VIM, Mudim, etc. However vnikey supports only VNI type mode (aka "Vietnamese number key based"). Personally I appreciate the intelligence and elegance of the VNI typing method. It's great to type English terms mixed with Vietnamese. But if you are already using TELEX or VIQR, then vnikey is not for you. vnikey also doesn't not provide the further features like auto-correct spelling errors. There is the better tools for that. vnikey focuses on the main purpose: easy to type Vietnamese as long as English. It tries to avoid to place accent marks when you type something looks like English.