docs(README): add general dev info about natilus plugins

README.md

@@ -25,3 +25,12 @@ additional information.
 
 After installing or uninstalling, you must quit and restart nautilus for the
 change to take effect (`nautilus -q`).
+
+## Development
+
+Exit nautilus with `nautilus --quit` and run nautilus with additional debugging
+output with `nautilus --no-desktop`.
+
+- [API Reference]
+
+[API Reference]: https://gnome.pages.gitlab.gnome.org/nautilus-python/class-nautilus-python-menu-provider.html