Add Expo template

templates/expo-supabase.md

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+# Expo + Supabase Template (Mobile)
+
+## Tech Stack
+- Framework: Expo SDK 51+
+- Database: Supabase (PostgreSQL)
+- Auth: Supabase Auth
+- Navigation: Expo Router
+- Styling: NativeWind (Tailwind for RN)
+- Language: TypeScript
+
+## Project Structure
+```
+/app
+  /(tabs)       # Tab navigation
+  /(auth)       # Auth screens
+  _layout.tsx
+/components
+/lib
+  supabase.ts
+/hooks
+```
+
+## Initial Setup
+```bash
+npx create-expo-app@latest --template tabs
+npm install @supabase/supabase-js
+npm install nativewind
+```
+
+## Environment Variables
+```
+EXPO_PUBLIC_SUPABASE_URL=
+EXPO_PUBLIC_SUPABASE_ANON_KEY=
+```