apps.dashboard.models, .tests & .views all handle new list creation when a new task item is added (but for now, undesirably, always a new list for each task item; made migrations accordingly

apps/dashboard/models.py

@@ -1,4 +1,9 @@
 from django.db import models
 
+class List(models.Model):
+    pass
+
 class Item(models.Model):
     text = models.TextField(default='')
+    list = models.ForeignKey(List, default=None, on_delete=models.CASCADE)
+