Add README.md

Author: hmongcodequest

README.md

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+# Steering ETS2 Controller
+
+This repository hosts the compiled release files (Android APK & PC EXE) for the **Steering ETS2 Controller** project.
+
+## Download the App
+
+You can find the latest releases in the `releases/` directory:
+
+- 📱 **Android App (APK):** [Download Latest APK](https://github.com/hmongcodequest/steering-ets2-controller/raw/main/releases/android/steering-ets2-v1.0.3.apk)
+- 💻 **PC Server (EXE):** [Download Latest EXE](https://github.com/hmongcodequest/steering-ets2-controller/raw/main/releases/pc/VJoyServer-v1.0.6.exe)
+
+## Folder Structure
+- `releases/android/`: Contains the Android APK files.
+- `releases/pc/`: Contains the PC Server executable and the `version.json` file used for the PC auto-updater.
+
+## Auto-Update System
+- **Android:** The Android application uses Firebase to check for updates. Make sure the `downloadUrl` in Firebase points to the raw link of the latest APK in this repository.
+- **PC:** The PC application checks the `version.json` file in this repository to automatically detect and download new updates.
+
+## Developed by
+Developed by Keng.