docs: add comprehensive README with project overview

- Add detailed README.md with project description and purpose
- Document technical specifications including architecture and technology stack
- Include project structure overview with module descriptions
- List key features including offline-first design and Firebase sync
- Specify target SDK 35, minimum SDK 26, and major dependency versions
- Add educational disclaimer about learning purpose with AI tools

Author: dpconde

README.md

@@ -0,0 +1,67 @@
+> This is a personal side project created for educational purposes, aimed at helping me learn how to code by experimenting with AI tools like Claude Code.
+
+# SofiaTracker 👶
+SofiaTracker is a modern Android application designed to help parents track their baby's daily activities including sleeping, feeding, and diaper changes. Built with Jetpack Compose and following clean architecture principles, the app provides a seamless way to monitor your baby's patterns and maintain a digital log of important events.
+
+## 🎯 Purpose
+The app allows parents to:
+- Track baby's sleep patterns and duration
+- Record feeding events with bottle amounts
+- Log diaper changes with notes
+- View statistics and patterns over time
+- Sync data across devices using Firebase
+- Access data offline with local storage
+
+## 🏗️ Technical Specifications
+
+### Architecture
+- **Architecture Pattern**: Clean Architecture with modular structure
+- **UI Framework**: Jetpack Compose with Material 3 Design
+- **Dependency Injection**: Hilt
+- **Navigation**: Navigation Compose
+- **Build System**: Gradle with Kotlin DSL and Convention Plugins
+
+### Technology Stack
+- **Target SDK**: 35 (Android 14)
+- **Minimum SDK**: 26 (Android 8.0)
+- **Kotlin**: 2.1.10
+- **Compose BOM**: 2024.04.01
+- **Room Database**: 2.7.2 (local storage)
+- **Firebase**: 33.1.2 (cloud sync)
+- **WorkManager**: 2.9.1 (background sync)
+- **DataStore**: 1.0.0 (preferences)
+
+### Project Structure
+```
+SofiaTracker/
+├── app/                          # Main application module
+├── core/
+│   ├── data/                     # Data layer with repositories
+│   ├── database/                 # Room database entities and DAOs
+│   ├── datastore/                # SharedPreferences wrapper
+│   ├── designsystem/             # Theme and design components
+│   ├── domain/                   # Use cases and domain models
+│   ├── model/                    # Data models
+│   ├── network/                  # Firebase integration
+│   └── ui/                       # Shared UI components
+├── feature/
+│   ├── home/                     # Main tracking screens
+│   ├── settings/                 # App settings
+│   └── statistics/               # Data visualization
+└── build-logic/                  # Gradle convention plugins
+```
+
+### Key Features
+- **Event Types**: Sleep, Eat (with bottle amounts), and Poop tracking
+- **Offline-First**: Local Room database with Firebase sync
+- **Background Sync**: WorkManager handles data synchronization
+- **Conflict Resolution**: Built-in sync conflict handling
+- **Modern UI**: Material 3 design with edge-to-edge display
+
+## 📄 License
+
+This project is licensed under the MIT License - see the LICENSE file for details.
+
+---
+
+Built with ❤️ for parents tracking their little ones' precious moments.