Added list of ephemeral models
diff --git a/planetstack/model_autodeletion.py b/planetstack/model_autodeletion.py
new file mode 100644
index 0000000..3cdefad
--- /dev/null
+++ b/planetstack/model_autodeletion.py
@@ -0,0 +1 @@
+ephemeral_models = ['ReservedResource','Sliver','Image','Network','NetworkSliver','Tag','SitePrivilege','SliceMembership','SliceTag','Reservation','Slice']