Update README.md

Author: Mistra1n

README.md

@@ -40,7 +40,22 @@ sudo ./uninstall.sh	                      Remove ChameleonGRUB
 ```
 
 ## 📸 Theme Gallery
-Cyberpunk	Tux	Minimal
+## 🎨 Theme Previews  
+
+<div align="center">  
+  <img src="https://raw.githubusercontent.com/mistra1n/ChameleonGRUB/main/screenshots/grub_01.png" width="45%">  
+  <img src="https://raw.githubusercontent.com/mistra1n/ChameleonGRUB/main/screenshots/grub_02.png" width="45%">
+  <img src="https://raw.githubusercontent.com/mistra1n/ChameleonGRUB/main/screenshots/grub_03.png" width="45%">
+  <img src="https://raw.githubusercontent.com/mistra1n/ChameleonGRUB/main/screenshots/grub_04.png" width="45%">
+  <img src="https://raw.githubusercontent.com/mistra1n/ChameleonGRUB/main/screenshots/grub_05.png" width="45%">
+  <img src="https://raw.githubusercontent.com/mistra1n/ChameleonGRUB/main/screenshots/grub_06.png" width="45%">
+  <img src="https://raw.githubusercontent.com/mistra1n/ChameleonGRUB/main/screenshots/grub_07.png" width="45%">
+  <img src="https://raw.githubusercontent.com/mistra1n/ChameleonGRUB/main/screenshots/grub_08.png" width="45%">
+  <img src="https://raw.githubusercontent.com/mistra1n/ChameleonGRUB/main/screenshots/grub_09.png" width="45%">
+  <img src="https://raw.githubusercontent.com/mistra1n/ChameleonGRUB/main/screenshots/grub_10.png" width="45%">
+  <img src="https://raw.githubusercontent.com/mistra1n/ChameleonGRUB/main/screenshots/grub_11.png" width="45%">
+  <img src="https://raw.githubusercontent.com/mistra1n/ChameleonGRUB/main/screenshots/grub_12.png" width="45%">
+</div>  
 
 ## ⚙️ Configuration