docs: Add Android SDK setup instructions

Author: VibePocket User

SETUP_ANDROID_SDK.md

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+# Android SDK Setup Instructions
+
+## Quick Setup (for this environment)
+
+The build requires Android SDK which needs to be installed manually. Here are the options:
+
+## Option 1: Install via Android Studio (Recommended)
+
+1. Download and install Android Studio from https://developer.android.com/studio
+2. Open Android Studio → Configure → SDK Manager
+3. Install Android SDK Platform 34 (or version specified in build.gradle)
+4. Set ANDROID_HOME environment variable:
+   ```bash
+   export ANDROID_HOME=$HOME/Android/Sdk
+   export PATH=$PATH:$ANDROID_HOME/platform-tools
+   ```
+
+## Option 2: Install Command Line Tools Only
+
+```bash
+# Create SDK directory
+mkdir -p ~/Android/Sdk
+
+# Download command line tools (manual download required)
+# Visit: https://developer.android.com/studio#command-tools
+# Download: commandlinetools-linux-XXXXX_latest.zip
+
+# Extract to proper location
+cd ~/Android/Sdk
+unzip commandlinetools-linux-XXXXX_latest.zip
+mkdir -p cmdline-tools
+mv cmdline-tools latest
+mv latest cmdline-tools/
+
+# Accept licenses and install platform
+export ANDROID_HOME=$HOME/Android/Sdk
+export PATH=$PATH:$ANDROID_HOME/cmdline-tools/latest/bin
+
+yes | sdkmanager --licenses
+sdkmanager "platform-tools" "platforms;android-34" "build-tools;34.0.0"
+```
+
+## Option 3: Use Existing SDK (if available)
+
+If you have Android SDK installed elsewhere:
+
+```bash
+# Set ANDROID_HOME to existing SDK location
+export ANDROID_HOME=/path/to/android/sdk
+
+# Or create local.properties file
+echo "sdk.dir=/path/to/android/sdk" > local.properties
+```
+
+## Verify Setup
+
+```bash
+# Check ANDROID_HOME
+echo $ANDROID_HOME
+
+# Check SDK tools
+ls $ANDROID_HOME/platform-tools/adb
+
+# Try building
+cd /workspace/unstoppable-wallet-android
+./gradlew assembleDebug
+```
+
+## Current Status
+
+- ✅ Java 17 installed
+- ✅ Gradle wrapper working
+- ⚠️  Android SDK needs to be installed
+
+Once Android SDK is installed, run:
+```bash
+export JAVA_HOME=/usr/lib/jvm/java-17-openjdk-amd64
+export PATH=$PATH:$JAVA_HOME/bin
+export ANDROID_HOME=$HOME/Android/Sdk
+cd /workspace/unstoppable-wallet-android
+./deploy.sh
+```