Initial prototype of synchronizer

Change-Id: I45de04debd89e7007d7985728d51aa5d03178675
diff --git a/xos/synchronizer/model_policies/model_policy_User.py b/xos/synchronizer/model_policies/model_policy_User.py
new file mode 100644
index 0000000..8d14244
--- /dev/null
+++ b/xos/synchronizer/model_policies/model_policy_User.py
@@ -0,0 +1,14 @@
+def handle(user):
+    from core.models import Controller, ControllerSite, ControllerUser, User
+    from collections import defaultdict
+
+    # user = User.get(user_id)
+    
+    controller_users = ControllerUser.objects.filter(user=user)
+    existing_controllers = [cu.controller for cu in controller_users]
+    all_controllers = Controller.objects.all()
+    for controller in all_controllers:
+        if controller not in existing_controllers:
+            ctrl_user = ControllerUser(controller=controller, user=user)
+            ctrl_user.save()  
+