docs: add README with project overview, build instructions, and architecture

README.md

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+# MyIce Kotlin Multiplatform
+
+Ice hockey schedule and convocation viewer for Android, iOS, and Desktop (macOS/Windows/Linux).
+Port of the [Flutter app](https://gitea.parano.ch/herel/myice/myice_mobile) to Kotlin Multiplatform with Compose Multiplatform.
+
+## Features
+
+- **OAuth login** via Infomaniak OIDC (platform-specific: Custom Tabs on Android, ASWebAuthenticationSession on iOS, local HTTP server on Desktop)
+- **Schedule viewing** — games and practices with colored event cards
+- **Filtering** — by account, age group, sub-group, and event type (all/games/practices)
+- **Event details** — convocations with player rosters and staff lists
+- **Offline caching** — schedule data persisted locally for offline access
+- **Sub-group extraction** — automatically parses team sub-groups from event names
+
+## Tech Stack
+
+| Component | Technology |
+|-----------|-----------|
+| UI | Compose Multiplatform 1.11.1 (Material 3) |
+| Language | Kotlin 2.3.20 |
+| Networking | Ktor 3.5.1 (CIO on Android/Desktop, Darwin on iOS) |
+| Serialization | kotlinx.serialization 1.11.0 |
+| State | androidx.lifecycle ViewModel + StateFlow |
+| Storage | multiplatform-settings 1.3.0 |
+| Build | Gradle 9.5.1, AGP 8.13.2 |
+
+## Project Structure
+
+```
+composeApp/
+├── src/
+│   ├── commonMain/kotlin/ch/parano/myice/
+│   │   ├── App.kt                      # Root composable + routing
+│   │   ├── models/                     # Serializable data models
+│   │   ├── network/                    # ApiService, AuthTokenHolder, ApiConfig
+│   │   ├── auth/                       # OAuthClient interface, AuthSettings, TokenParser
+│   │   ├── cache/                      # ScheduleCache (chunked storage)
+│   │   ├── filter/                     # TypeFilter, EventFilter logic
+│   │   ├── viewmodel/                  # AuthViewModel, ScheduleViewModel, EventDetailViewModel
+│   │   └── ui/
+│   │       ├── theme/                  # MyIceTheme (Material 3, indigo)
+│   │       ├── components/             # EventCard, FilterDropdown, LoadingIndicator
+│   │       └── screens/               # LoginScreen, ScheduleScreen, EventDetailScreen
+│   ├── androidMain/                    # Android OAuth, MainActivity, CIO engine
+│   ├── iosMain/                        # iOS OAuth, MainViewController, Darwin engine
+│   ├── desktopMain/                    # Desktop OAuth, Main.kt, CIO engine
+│   └── commonTest/                     # Unit tests (47 tests)
+├── build.gradle.kts
+└── src/androidMain/AndroidManifest.xml
+```
+
+## Build & Run
+
+### Prerequisites
+
+- JDK 11+
+- Android SDK (for Android builds)
+- Xcode (for iOS builds, macOS only)
+- Kotlin Multiplatform Mobile plugin (for iOS)
+
+### Desktop (macOS)
+
+```bash
+# Run directly
+./gradlew composeApp:run
+
+# Build distributable DMG
+./gradlew composeApp:packageDistributionForCurrentOS
+# Output: composeApp/build/compose/binaries/main/dmg/myice-1.0.0.dmg
+```
+
+### Android
+
+```bash
+# Debug APK
+./gradlew composeApp:assembleDebug
+
+# Release APK (requires keystore, see below)
+./gradlew composeApp:assembleRelease
+
+# Install and launch on connected device
+~/Library/Android/sdk/platform-tools/adb install -r composeApp/build/outputs/apk/debug/composeApp-debug.apk
+~/Library/Android/sdk/platform-tools/adb shell am start -n ch.parano.myice/.MainActivity
+```
+
+#### Release Signing
+
+Create `keystore.properties` at the project root (gitignored):
+
+```properties
+storeFile=myice.keystore
+storePassword=<your-password>
+keyAlias=<your-alias>
+keyPassword=<your-password>
+```
+
+Generate a keystore:
+
+```bash
+keytool -genkeypair -v \
+  -keystore myice.keystore \
+  -alias myice \
+  -keyalg RSA -keysize 2048 \
+  -validity 10000
+```
+
+### iOS
+
+The Swift source files and `Info.plist` are in `iosApp/`. The Xcode project (`.xcodeproj`) must be created manually:
+
+1. Open Xcode → New Project → iOS App
+2. Name it `MyIceApp`, bundle ID `ch.parano.myice`
+3. Add the Swift files from `iosApp/`
+4. Set the custom URL scheme `myice` in the URL Types
+5. Build and run on a simulator or device
+
+### Tests
+
+```bash
+./gradlew composeApp:desktopTest
+```
+
+## Architecture
+
+```
+┌─────────────────────────────────┐
+│           UI (Compose)          │
+│  LoginScreen  ScheduleScreen    │
+│           EventDetailScreen     │
+└──────────────┬──────────────────┘
+               │ StateFlow
+┌──────────────┴──────────────────┐
+│         ViewModels              │
+│  AuthVM  ScheduleVM  EventDetVM │
+└──────────────┬──────────────────┘
+               │
+┌──────────────┴──────────────────┐
+│     AuthSettings + Cache        │
+│  (multiplatform-settings)       │
+└──────────────┬──────────────────┘
+               │
+┌──────────────┴──────────────────┐
+│        ApiService (Ktor)        │
+│  /userinfo  /accounts  /schedule│
+│  /game/{id}                     │
+└─────────────────────────────────┘
+```
+
+## Backend
+
+The app communicates with the MyIce FastAPI backend at `https://myice.parano.ch`.
+
+| Endpoint | Description |
+|----------|-------------|
+| `GET /login` | OAuth login redirect (Infomaniak OIDC) |
+| `GET /userinfo` | Current user info (email) |
+| `GET /accounts` | Available accounts/teams |
+| `GET /schedule?account=` | Events for an account |
+| `GET /game/{id}?account=` | Event detail with convocation |
+
+## License
+
+Private project.