add readmes to examples.

examples/scene_rotate/README.md

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+## About
+
+Collects the names of all available scenes, rotates through them and prints their name.
+
+## Use
+
+This example assumes the existence of a `config.toml`, placed next to `__main__.py`:
+
+```toml
+[connection]
+host = "localhost"
+port = 4455
+password = "mystrongpass"
+```