Add README

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

README.md

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+# PlantTime
+
+A plant identification and care management iOS app built with SwiftUI.
+
+## Features
+
+- **Plant Identification** - Identify plants using on-device ML (Core ML) with PlantNet API fallback
+- **Plant Collection** - Save and organize your identified plants
+- **Room Organization** - Group plants by room (Kitchen, Living Room, Bedroom, etc.)
+- **Care Scheduling** - Track watering, fertilizing, repotting, pruning, and pest control
+- **Today View** - Dashboard showing overdue and today's care tasks
+- **Progress Photos** - Capture growth photos with time-lapse playback
+- **Photo Reminders** - Scheduled reminders for progress photos (weekly, bi-weekly, monthly)
+- **CloudKit Sync** - Sync plants and care data across devices via iCloud
+- **Dark Mode** - Full dark mode support with semantic color tokens
+
+## Screenshots
+
+*Coming soon*
+
+## Requirements
+
+- iOS 17.0+
+- Xcode 15.0+
+- Swift 5.9+
+
+## Architecture
+
+Clean Architecture + MVVM with three layers:
+
+```
+Presentation (SwiftUI Views + ViewModels)
+    ↓
+Domain (Use Cases + Entities + Repository Protocols)
+    ↓
+Data (Repository Implementations + Data Sources)
+```
+
+Key patterns:
+- Dependency Injection via `DIContainer`
+- Actor-based concurrency for thread safety
+- Core Data + CloudKit for persistence and sync
+
+## Setup
+
+1. Clone the repository
+2. Open `PlantGuide.xcodeproj` in Xcode
+3. Configure your API keys in `App/Configuration/APIKeys.swift`:
+   - PlantNet API key (get one at [my.plantnet.org](https://my.plantnet.org))
+   - Trefle API key (get one at [trefle.io](https://trefle.io))
+4. Set up CloudKit:
+   - Enable iCloud capability in Signing & Capabilities
+   - Create CloudKit container: `iCloud.com.yourteam.PlantGuide`
+5. Build and run
+
+## ML Model
+
+Uses PlantNet-300K ResNet50 for on-device plant classification:
+- Input: 224x224 RGB image
+- Output: 1,081 plant species probabilities
+
+## License
+
+MIT