feat: add persistence for task

lib/putzplan/tasks/task.ex

@@ -14,6 +14,11 @@ defmodule Putzplan.Tasks.Task do
     end
   end
 
+  sqlite do
+    table "tasks"
+    repo Putzplan.Repo
+  end
+
   # Attributes are the simple pieces of data that exist on your resource
   attributes do
     # Add an autogenerated UUID primary key called `:id`.