chore: add features to README

Author: julian-farbcode

README.md

@@ -9,7 +9,10 @@ A Laravel package for managing state in API resources.
 
 **Features:**
 
--   TODO
+- 🧘🏻‍♂️ **Unified Resources:** Provide multiple resource representations through a single resource class.
+- 🏗️ **Built-in States:** Comes with default states for common use cases.
+- 🪄 **Magic Methods:** Optional magic methods for a more fluent and expressive syntax.
+- 🛠️ **Hackable:** Extend the package with your own custom states and logic.
 
 ## Documentation