docs: Add planned features section to README

Author: Eatgrapes

README.md

@@ -21,6 +21,12 @@ A native Java binding for the [Live2D Cubism SDK](https://www.live2d.com/en/sdk/
 - [x] **Interaction**: Dragging support and hit detection.
 - [x] **Rendering**: OpenGL-based rendering and texture management.
 
+## Planned Features
+
+- [ ] **Lip Sync**: Audio-based mouth movement.
+- [ ] **Auto Blink & Breath**: Automatic eye blinking and breathing effects.
+- [ ] **User Data**: Handling user data events from motion files.
+
 ## About JNI Integration
 
 JNI (Java Native Interface) is a programming framework that enables Java code to interact with native applications and libraries written in languages like C or C++. In this project: