Update README.md (#538)

Author: josithg

README.md

@@ -1034,6 +1034,7 @@ A list of **Free** and **Open Source Software** ***(FOSS)*** for **Android** –
 * [**APKLab**](https://github.com/APKLab/APKLab)
 * [**Apktool**](https://github.com/iBotPeaches/Apktool)
 * [**APKToolGUI**](https://github.com/AndnixSH/APKToolGUI)
+* [**Shizuku**](https://github.com/RikkaApps/Shizuku)
 * [**Universal Android Debloater GUI**](https://github.com/Universal-Debloater-Alliance/universal-android-debloater)
 
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