add hostadmin app

backend/hostadmin/models.py

@@ -0,0 +1,10 @@
+from django.db import models
+
+
+class Domain(models.Model):
+    name = models.CharField(max_length=255, unique=True)
+    owner = models.ForeignKey('authentication.ToolshedUser', on_delete=models.CASCADE, related_name='domains')
+    open_registration = models.BooleanField(default=False)
+
+    def __str__(self):
+        return self.name