Update docs

docs/main.md

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 3. Database: Postgres
 4. Mobile: Adaptive LiveView (ReactNative?, Flutter?)
 5. Bot: Telegram
+
+### API Requirements
+
+#### Authentication
+
+- User registration and login endpoints
+- JWT token-based authentication
+- Password reset functionality
+
+#### User Management
+
+- CRUD operations for user profiles
+- User preferences and settings
+- User groups management for shared budgets
+
+#### Accounts
+
+- Create/update/delete financial accounts
+- Support multiple currencies
+- Track account balances
+- Transfer between accounts
+
+#### Transactions
+
+- Record income and expenses
+- Bulk transaction import
+- Recurring transactions
+- Transaction categories management
+- Transaction tags
+- Attach receipts/documents to transactions
+
+#### Budget Planning
+
+- Create budget plans for different periods
+- Set spending limits by category
+- Track actual vs planned spending
+- Budget templates
+- Budget sharing within groups
+
+#### Reports & Analytics
+
+- Spending trends by category
+- Income vs expense analysis
+- Monthly/yearly reports
+- Custom date range reports
+- Export data in various formats (CSV, PDF)
+
+#### Notifications
+
+- Budget limit alerts
+- Bill payment reminders
+- Unusual spending patterns
+- Group activity notifications
+
+#### Currency
+
+- Real-time currency conversion
+- Support for multiple currencies
+- Historical exchange rates