docs: add README with plugin overview and actions breakdown

README.md

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+# Deck Plugin
+
+Control your deck - Change the brightness, pages, etc.
+
+This plugin provides essential controls for managing your StreamController deck, including navigation, display settings, and state management.
+
+## Actions
+
+### Change Page
+Switch to a specific page on your deck with optional return timeout functionality.
+
+### Change State
+Navigate to a specific state on the current input with optional auto-return feature.
+
+### Go To Sleep
+Activate the deck's screen saver to put the deck to sleep.
+
+### Set Brightness
+Set the deck's screen brightness to a specific percentage value (0-100%).
+
+### Adjust Brightness
+Increase or decrease the deck's brightness by a specified amount with configurable minimum brightness limits.
+
+## Installation
+
+This plugin can be installed through the StreamController plugin store.
+
+## Requirements
+
+- StreamController version 1.0.0 or higher
+- For Change State action: StreamController version 1.5.0-beta.5 or higher
+
+## License
+
+See [LICENSE](LICENSE) file for details.
+
+## Repository
+
+https://github.com/StreamController/DeckPlugin