Create EXTENSIONS.md

Flyoobe.Extensions/EXTENSIONS.md

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+# Flyoobe Extensions
+
+Here you can find community extensions for Flyoobe.  
+Copy the provided `.ps1` raw link and install it via the **Get Extensions → Install from URL** option in the app.
+
+---
+
+## 🛡 Microsoft Defender Maintenance
+**Description:** Update Defender signatures, repair definitions, or check Defender status.  
+**Options:**  
+- Update signatures  
+- Repair definitions and update  
+- Show Defender status  
+
+🔗 [Raw script link](https://raw.githubusercontent.com/builtbybel/Flyoobe/main/Flyoobe.Extensions/DefenderMaintenance.ps1)
+
+---
+
+## 🎮 Gaming Tweaks
+**Description:** Optimize Windows 11 for gaming (Game Mode, HAGS, Power Plans, DVR).  
+**Options:**  
+- Enable Game Mode  
+- Disable Game Mode  
+- Toggle Hardware GPU Scheduling  
+- Switch Power Plans  
+- Disable Game DVR  
+- Clear Shader Cache  
+
+🔗 [Raw script link](https://raw.githubusercontent.com/builtbybel/Flyoobe/main/Flyoobe.Extensions/GamingTweaks.ps1)
+
+---
+