feat: add sudo-demo plugin

sudo-demo.yazi/README.md

@@ -0,0 +1,25 @@
+# sudo-demo.yazi
+
+Just an example showing how to use `sudo` in a Yazi plugin, and the plugin itself doesn't offer any features beyond logging a message.
+
+## Installation
+
+```sh
+ya pack -a yazi-rs/plugins:sudo-demo
+```
+
+## Usage
+
+Add this to your `~/.config/yazi/keymap.toml`:
+
+```toml
+[[manager.prepend_keymap]]
+on   = "<C-t>"
+run  = "plugin sudo-demo"
+```
+
+Press <kbd>Ctrl</kbd> + <kbd>t</kbd> to run the plugin, you should [see a message in the log](https://yazi-rs.github.io/docs/plugins/overview#logging).
+
+## License
+
+This plugin is MIT-licensed. For more information check the [LICENSE](LICENSE) file.