Add instruction to complete user profile before editing first work

[goose-life]

From a new user:

We’ve set up a country and are trying to create a work but keep getting the following errrors Invalid FRBR URI Frbr Uri: This field is required.

To be honest I forget exactly what happens, but it's something like the JavaScript trying to get a default country off the user in the work edit view — I remember it not making a whole lot of sense when I finally figured it out last time.

My response:

You need to complete your user profile (python manage.py createsuperuser only records the bare minimum that the django base user model needs, but our user model has a bit more information). You can do that by going to http://127.0.0.1:8000/accounts/profile/ and filling in the required fields. You should then be able to successfully create a work.

(For the record, this fix worked for me and for the new user.)