Add english anchors

[KeziahMoselle]

As stated in https://github.com/vuejs-translations/guidelines#retaining-original-anchors, translated versions of the repo need to add the original english anchors.
But this takes time to add for each translation. I think it would be great to have those anchors in the source repo so they are already ready to go when we are translating.

What do you think?

[yyx990803]

This is a good point.

Manually doing this is quite a bit of work though, maybe we can write an automated script to generate them.

/cc @Jinjiang

[wxsms]

I've created a PR for this.