after add, stage

pttodoest/src/main.rs

@@ -24,6 +24,9 @@ fn main() {
             files.files[0]
                 .append(Delta::now(patch))
                 .expect("failed to add");
+            files.files[0]
+                .stage_persisted()
+                .expect("failed to stage added");
         }
     }