Add README with build/run instructions

README.md

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+# Signal Elsewhere
+
+An interactive educational experience about money, technology, food, and health — built as a Capacitor Android app.
+
+## Development
+
+The app is a single-page HTML/JS application. No build step is needed for the web version.
+
+```bash
+# Serve locally for development
+python3 -m http.server 8080
+# or
+npx serve .
+```
+
+Open `http://localhost:8080` in your browser.
+
+## Android Build
+
+```bash
+# Install dependencies
+npm install
+
+# Copy web assets to Android
+npx cap copy
+
+# Sync Capacitor config
+npx cap sync android
+
+# Open in Android Studio
+npx cap open android
+```
+
+From Android Studio, build and run on a device or emulator.
+
+## Structure
+
+- `index.html` — main application source
+- `www/` — production web directory (copied to Android)
+- `android/` — Android project (Capacitor)
+- `capacitor.config.json` — Capacitor configuration
+
+## License
+
+ISC