feat(people): Add first user data fields

To support choices in CharFields, Django choices enums have been
backported by bringing in the source file from Django 3.0.3

See #1

backports/__init__.py

@@ -0,0 +1,6 @@
+"""
+These files are backported functionality from future versions of Django.
+
+- models.db.enums - copied from Django 3.0.3
+  See https://github.com/django/django/blob/3.0.3/django/db/models/enums.py
+"""