add doc.go files to subpackages
diff --git a/openstack/storage/v1/accounts/doc.go b/openstack/storage/v1/accounts/doc.go
new file mode 100644
index 0000000..5c94e1a
--- /dev/null
+++ b/openstack/storage/v1/accounts/doc.go
@@ -0,0 +1,5 @@
+/* The accounts package defines operations performed on an object-storage account.
+
+Reference: http://developer.openstack.org/api-ref-objectstorage-v1.html#storage_account_services
+*/
+package accounts