Vue-cli: Add JSX feature

[zzuu666]

What problem does this feature solve?

When I use vue-cli v3.0.0-beta.15 , I create a Vue project by vue create vue-project.I want to this project use JSX. I have to config babelrc by myself, now. I think should add an option in step 2 Check the features needed for your project.

What does the proposed API look like?

I think should add an option in step 2 Check the features needed for your project.

[yyx990803]

JSX is included by default. There's nothing you need to do.