docs: add comprehensive troubleshooting guide

TROUBLESHOOTING.md

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+# Troubleshooting Guide
+
+## Common Installation Issues
+
+### App won't install on Windows 10
+**Problem**: Installation fails or gets blocked
+**Solution**: 
+- Temporarily disable Windows Defender during installation
+- Try downloading the installer directly from the releases page
+- Run installer as Administrator
+
+### Dependencies fail to install
+**Problem**: `yarn install` fails with errors
+**Solution**:
+- Clear node_modules: `rm -rf node_modules`
+- Use legacy peer deps: `yarn install --legacy-peer-deps`
+- Ensure you have Node.js 16+ installed
+
+## Common Runtime Errors
+
+### App crashes when visiting specific sites (like Twitter)
+**Problem**: App crashes when navigating to certain websites
+**Solution**:
+- This is a known issue being worked on
+- Temporary workaround: Avoid those specific sites in Responsively
+
+### Blank screen with Next.js applications
+**Problem**: Shows blank screen when loading local Next.js apps
+**Solution**:
+- Use your local IP address instead of localhost
+- Example: Use `http://192.168.0.100:3000` instead of `http://localhost:3000`
+
+## Performance Issues
+
+### App runs slowly with multiple devices
+**Problem**: Performance degrades with many device previews
+**Solution**:
+- Reduce the number of simultaneous device previews
+- Close other memory-intensive applications
+- Restart the app periodically