Answers for "how to add vue js on my npm project"

install vue-cli

npm install -g vue-cli    //make sure you have node and npm installed 
vue init webpack <appname>  //  eg:  vue init webpack myapp
cd <appname>               // cd myapp
npm install
npm run dev  //server will start in port 8080

How to create a vue cli app

Use npx @vue/cli create myapp