created CustomFilter model and api

cookbook/views/lists.py

@@ -185,6 +185,22 @@ def automation(request):
     )
 
 
+@group_required('user')
+def custom_filter(request):
+    # recipe-param is the name of the parameters used when filtering recipes by this attribute
+    # model-name is the models.js name of the model, probably ALL-CAPS
+    return render(
+        request,
+        'generic/model_template.html',
+        {
+            "title": _("Custom Filters"),
+            "config": {
+                'model': "CUSTOM_FILTER",  # *REQUIRED* name of the model in models.js
+            }
+        }
+    )
+
+
 @group_required('user')
 def user_file(request):
     try: