Add README with project overview and architecture summary

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

README.md

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+# Conjuga
+
+A Spanish verb conjugation learning app for iOS. Practice all 20 tenses with spaced repetition, handwriting recognition, and vocabulary courses.
+
+## Features
+
+- **Conjugation Practice** — Flashcards, typing, multiple choice, handwriting, sentence building, and full table modes
+- **Spaced Repetition** — SM-2 algorithm tracks what you know and surfaces what you don't
+- **1,750 Verbs** — From basic to expert, with irregular form highlighting
+- **20 Tenses** — Every indicative, subjunctive, conditional, and imperative tense
+- **Grammar Guide** — 20 tense guides with conjugation tables + 20 grammar topic notes (Ser vs Estar, Por vs Para, etc.)
+- **Vocabulary Courses** — Weekly decks with example sentences
+- **Progress Tracking** — Streaks, daily goals, accuracy stats, and achievement badges
+- **CloudKit Sync** — Review progress syncs across devices
+- **Widgets** — Daily progress, word of the day, and weekly stats
+- **Text-to-Speech** — Hear any verb pronounced in Spanish
+
+## Architecture
+
+- **SwiftUI** + **SwiftData** with a dual-store configuration:
+  - **Local store** — Reference data (verbs, forms, guides) seeded from JSON on first launch
+  - **Cloud store** — User data (review cards, progress, streaks) synced via CloudKit
+- **SharedModels** package shared between the app and widget extension
+
+## Requirements
+
+- iOS 18+
+- Xcode 16+
+
+## Building
+
+Open `Conjuga/Conjuga.xcodeproj` in Xcode and run on a simulator or device. Data seeds automatically on first launch.