examples: point to gtk-rs-core ones
# Examples
-Consists of various examples to get familiar with writing GTK applications using the Rust bindings.
+Consists of various examples to get familiar with writing GTK 4 applications using the Rust bindings. Note there are other examples part of [gtk-rs-core](https://github.com/gtk-rs/gtk-rs-core/tree/master/examples)
- [Basic example](./basics/)
- [Using the Builder pattern](./builder_pattern/)
