feat: Added Shappky app for performance boosting in the Battery Management section

Author: fynks

docs/android-root-apps/index.md

@@ -592,6 +592,7 @@ head:
 - **[NoWakeLock](https://github.com/NoWakeLock/NoWakeLock)** - An application that controls Android wakelocks can run on Android N and later. `FOSS` `[LSP]`
 - **[Plus Plus Battery](https://github.com/dijia1124/plusplusbattery)** - Real-time battery stats & health estimator for OnePlus/Oppo/Realme phones. `FOSS` | [🌱 F-Droid](https://f-droid.org/en/packages/com.dijia1124.plusplusbattery/)
 - **[SaverTuner](https://codeberg.org/s1m/savertuner)** - Allows you to take advantage of this built-in battery saver. You can now set different profiles that save the battery more or less aggressively. `FOSS` | [🌱 F-Droid](https://f-droid.org/packages/s1m.savertuner/)
+- **[Shappky](https://github.com/YasserNull/shappky)** - A simple app to boost performance by stopping background apps, relying on Root/Shizuku permissions. `FOSS` `[M]`
 - **⭐ [Universal GMS Doze](https://github.com/gloeyisk/universal-gms-doze)** - Patches Google Play services app and certain processes/services to be able to use battery optimization. `FOSS` `[M]`
 - **[Xtreme-Battery-Saver](https://github.com/Magisk-Modules-Alt-Repo/Xtreme-Battery-Saver)** - An extreme battery saver Magisk Module for users who want to really stretch their battery life. `FOSS` `[M]`