Improve documentation about how a user entity with participant field will be automatically used

Solution:

Go to /admin/config/people/accounts/fields/add-field
Add VG Wort participant info field to user.

Thats it!

@stevenx thanks for working on this.

I think we need a section on author information that details both the interaction with a user entity reference field and how to add a custom entity reference field with vg wort participant info. These things are very related. So we need to move around stuff in the readme a bit.

One more thing needs to be done:

add the field to your node display for each content type you need vgwort