Add guide for setting up Android emulator without Studio

docs/en/framework/ui/react-native/setting-up-android-emulator.md

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+# Setting Up Android Emulator Without Android Studio (Windows, macOS, Linux)
+
+This guide explains how to install and run an Android emulator **without Android Studio**, using only **Command Line Tools**.
+
+---
+
+## 1. Download Required Tools
+
+Go to: [https://developer.android.com/studio#command-tools](https://developer.android.com/studio#command-tools)  
+Download the "Command line tools only" package for your OS:
+
+- **Windows:** `commandlinetools-win-*.zip`
+- **macOS:** `commandlinetools-mac-*.zip`
+- **Linux:** `commandlinetools-linux-*.zip`
+
+---
+
+## 2. Create the Required Directory Structure
+
+### Windows:
+```
+C:\Android\
+└── cmdline-tools\
+    └── latest\
+        └── [extract all files from the zip here]
+```
+
+### macOS / Linux:
+```
+~/Android/
+└── cmdline-tools/
+    └── latest/
+        └── [extract all files from the zip here]
+```
+
+> You need to create the `latest` folder manually.
+
+---
+
+## 3. Set Environment Variables
+
+### Windows (temporary for CMD session):
+```cmd
+set PATH=C:\Android\cmdline-tools\latest\bin;C:\Android\platform-tools;C:\Android\emulator;%PATH%
+```
+
+### macOS / Linux:
+Add the following to your `.bashrc`, `.zshrc`, or `.bash_profile` file:
+
+```bash
+export ANDROID_HOME=$HOME/Android
+export PATH=$PATH:$ANDROID_HOME/cmdline-tools/latest/bin
+export PATH=$PATH:$ANDROID_HOME/platform-tools
+export PATH=$PATH:$ANDROID_HOME/emulator
+```
+
+> Apply the changes:
+```bash
+source ~/.zshrc  # or ~/.bashrc if you're using bash
+```
+
+---
+
+## 4. Install SDK Components
+
+Install platform tools, emulator, and a system image:
+
+```bash
+sdkmanager --sdk_root=$ANDROID_HOME "platform-tools" "platforms;android-34" "system-images;android-34;google_apis;x86_64" "emulator"
+```
+
+> On Windows, replace `$ANDROID_HOME` with `--sdk_root=C:\Android`.
+
+---
+
+## 5. Create an AVD (Android Virtual Device)
+
+### List available devices:
+```bash
+avdmanager list devices
+```
+
+### Create your AVD:
+```bash
+avdmanager create avd -n myEmu -k "system-images;android-34;google_apis;x86_64" --device "pixel"
+```
+
+---
+
+## 6. Start the Emulator
+
+```bash
+emulator -avd myEmu
+```
+
+The emulator window should open 
+
+---
+
+## Extra Tools and Commands
+
+### List connected devices with ADB:
+```bash
+adb devices
+```
+
+### Install an APK:
+```bash
+adb install myApp.apk
+```
+
+---
+
+## Troubleshooting
+
+| Problem | Explanation |
+|--------|-------------|
+| `sdkmanager not found` | Make sure `PATH` includes the `latest/bin` directory |
+| `x86_64 system image not found` | Make sure you've downloaded it using `sdkmanager` |
+| `emulator not found` | Add the `emulator` directory to `PATH` |
+| `setx` truncates path (Windows) | Use GUI to update environment variables manually |
+
+---
+
+## Summary
+
+You can now run an Android emulator without installing Android Studio, entirely through the command line. This emulator can be used for React Native or any mobile development framework.