docs: add documentation link to README for better accessibility

Author: ya7010

README.md

@@ -8,6 +8,10 @@
 pip install tppt
 ```
 
+## 📚 Documentation
+
+For detailed documentation, please visit [TPPT Documentation](https://yassun7010.github.io/tppt/).
+
 ## 🎯 Usage Examples
 
 ### 📝 Basic Presentation Creation