Add vue config

[Mikeyjou]

1. Add webpack config
2. In order to get rid of "Cant find module" error, I downgrade webpack-dev-server from 3.1.11 to 2.9.1

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}