add readme

README.md

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-# openworkout-mobile
-The openworkout mobile app
+# OpenWorkout
+
+**OpenWorkout** is a free, open-source workout tracking app for iOS, Android, and web. Build a training split, log your sets, and let the app suggest progressive overload as you get stronger — all stored locally on your device.
+
+Website: [openworkout.org](https://openworkout.org)
+
+## Features
+
+- **Custom training splits** — organize workouts into days (e.g. Push/Pull/Legs) and assign exercises to each.
+- **Routines** — reusable workout templates you can start with one tap.
+- **Workout logging** — track sets, reps, and weight as you train.
+- **Progressive overload suggestions** — get hints on when to increase weight or reps based on your history.
+- **Stats & recent activity** — review past workouts and exercise trends.
+- **Offline-first** — all data is stored locally with SQLite, no account or internet connection required.
+
+## Tech stack
+
+- [Expo](https://expo.dev) / [React Native](https://reactnative.dev) with the [Expo Router](https://docs.expo.dev/router/introduction/) file-based navigation
+- [NativeWind](https://www.nativewind.dev) (Tailwind CSS for React Native)
+- [expo-sqlite](https://docs.expo.dev/versions/latest/sdk/sqlite/) for local persistence
+- TypeScript
+- Jest + Testing Library for tests
+
+## Getting started
+
+### Prerequisites
+
+- [Node.js](https://nodejs.org) (LTS recommended)
+- npm
+- [Expo Go](https://expo.dev/go) app on your phone, or an iOS/Android simulator, to run the app
+
+### Installation
+
+```bash
+npm install
+```
+
+### Running the app
+
+```bash
+npm start
+```
+
+This starts the Expo dev server. From there you can open the app on:
+
+- An iOS simulator (`npm run ios`)
+- An Android emulator (`npm run android`)
+- The web (`npm run web`)
+- Your own device via the Expo Go app, by scanning the QR code
+
+## Project structure
+
+```
+app/
+  (tabs)/        Tab screens: home, routines, stats, explore, profile
+  components/    Reusable UI components
+  db/            SQLite data access layer (exercises, routines, sets, splits, workouts)
+  lib/           Workout generation and progressive overload logic
+  hooks/         Custom React hooks
+  constants/     App-wide constants
+```
+
+## Scripts
+
+| Command              | Description                       |
+| --------------------- | ---------------------------------- |
+| `npm start`           | Start the Expo dev server           |
+| `npm run android`     | Run on an Android emulator/device   |
+| `npm run ios`         | Run on an iOS simulator/device      |
+| `npm run web`         | Run in a web browser                |
+| `npm run lint`        | Lint the project                    |
+| `npm test`            | Run the test suite                  |
+| `npm run test:watch`  | Run tests in watch mode             |
+
+## Contributing
+
+Issues and pull requests are welcome. If you're planning a larger change, please open an issue first to discuss what you'd like to change.
+
+## License
+
+MIT — see [LICENSE](./LICENSE).