add readmes to examples.

examples/hotkeys/README.md

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+## About
+
+Sets up some hotkeys to trigger certain actions. Registers a callback function to notify of scene switch event.
+
+Requires [Python Keyboard library](https://github.com/boppreh/keyboard).
+
+## Use
+
+Simply run the code and press the assigned hotkeys. Press `ctrl+enter` to exit.
+
+This example assumes the existence of a `config.toml`, placed next to `__main__.py`:
+
+```toml
+[connection]
+host = "localhost"
+port = 4455
+password = "mystrongpass"
+```
+
+It also assumes the existence of scenes named `START`, `BRB` and `END`.