Added users page

users/models.py

@@ -0,0 +1,13 @@
+from django.db import models
+from django.contrib.auth.models import User
+from instances.models import Instance
+
+
+class UserInstance(models.Model):
+    user = models.ForeignKey(User)
+    instance = models.ForeignKey(Instance)
+    is_change = models.BooleanField(default=False)
+    is_delete = models.BooleanField(default=False)
+
+    def __unicode__(self):
+        return self.instance.name