move callbacks/observer examples into examples/events/

examples/events/README.md

@@ -0,0 +1,8 @@
+# Events
+
+If you want to receive updates on certain events there are two routes you can take:
+
+-   Register a class that implements an `on_update(self, event) -> None` method on the `{Remote}.subect` class.
+-   Register callback functions/methods on the `{Remote}.subect` class, one for each type of update.
+
+Included are examples of both approaches.