Initial commit: Simple Notes Sync project setup

Features:
- Docker WebDAV server with docker-compose
- Server configuration with .env
- Project structure for Android app
- Complete documentation references
- MIT License

Server:
- bytemark/webdav Docker image
- Basic authentication
- Port 8080 exposed
- Volume mounts for data and logs
- Quick start README

Android:
- Project structure defined
- README with setup instructions
- Links to complete implementation guide

Status: Server running and tested ✓
Next: Android app implementation in Android Studio

android/README.md

@@ -0,0 +1,120 @@
+# Simple Notes - Android App
+
+## 🚧 Development Setup
+
+### Voraussetzungen
+
+- Android Studio Hedgehog (2023.1.1) oder neuer
+- JDK 17
+- Android SDK 34
+- Min SDK 24
+
+### Projekt in Android Studio öffnen
+
+```bash
+# In Android Studio:
+# File → New → New Project
+# Template: Empty Views Activity
+# 
+# Settings:
+# Name: Simple Notes
+# Package: com.example.simplenotes
+# Save location: /home/liq/gitProjects/simple-notes-sync/android/
+# Language: Kotlin
+# Minimum SDK: API 24
+# Build configuration: Kotlin DSL
+```
+
+### Dependencies
+
+Siehe `ANDROID_GUIDE.md` in project-docs für vollständige `build.gradle.kts`:
+
+**Hauptabhängigkeiten:**
+- Sardine Android (WebDAV Client)
+- Kotlin Coroutines
+- Gson (JSON)
+- WorkManager (Background Sync)
+- Material Design Components
+
+### Projektstruktur
+
+```
+android/
+└── app/
+    └── src/
+        └── main/
+            ├── AndroidManifest.xml
+            ├── java/com/example/simplenotes/
+            │   ├── MainActivity.kt
+            │   ├── NoteEditorActivity.kt
+            │   ├── SettingsActivity.kt
+            │   ├── models/
+            │   │   ├── Note.kt
+            │   │   └── SyncStatus.kt
+            │   ├── storage/
+            │   │   └── NotesStorage.kt
+            │   ├── sync/
+            │   │   ├── WebDavSyncService.kt
+            │   │   ├── WifiSyncReceiver.kt
+            │   │   ├── SyncWorker.kt
+            │   │   └── ConflictResolver.kt
+            │   ├── adapters/
+            │   │   └── NotesAdapter.kt
+            │   └── utils/
+            │       ├── DeviceIdGenerator.kt
+            │       ├── NotificationHelper.kt
+            │       ├── Extensions.kt
+            │       └── Constants.kt
+            └── res/
+                ├── layout/
+                ├── values/
+                └── drawable/
+```
+
+## 📖 Development Guide
+
+Vollständige Code-Beispiele und Implementation:
+- [ANDROID_GUIDE.md](https://github.com/inventory69/project-docs/blob/main/simple-notes-sync/ANDROID_GUIDE.md)
+- [IMPLEMENTATION_PLAN.md](https://github.com/inventory69/project-docs/blob/main/simple-notes-sync/IMPLEMENTATION_PLAN.md)
+
+## 🏗️ Build
+
+```bash
+# Debug Build
+./gradlew assembleDebug
+
+# Release Build
+./gradlew assembleRelease
+
+# Install on connected device
+./gradlew installDebug
+```
+
+## 🧪 Testing
+
+```bash
+# Run unit tests
+./gradlew test
+
+# Run instrumented tests
+./gradlew connectedAndroidTest
+```
+
+## 📝 TODO
+
+- [ ] Projekt in Android Studio erstellen
+- [ ] Dependencies einrichten
+- [ ] Models implementieren (Note.kt, SyncStatus.kt)
+- [ ] Storage Layer (NotesStorage.kt)
+- [ ] UI Layouts erstellen
+- [ ] Activities implementieren
+- [ ] Sync Service (WebDavSyncService.kt)
+- [ ] WLAN Detection (WifiSyncReceiver.kt)
+- [ ] WorkManager Setup (SyncWorker.kt)
+- [ ] Notifications (NotificationHelper.kt)
+- [ ] Error Handling
+- [ ] Testing
+
+---
+
+**Next Step:** Projekt in Android Studio erstellen und Code aus ANDROID_GUIDE.md übernehmen.