Add demo button to deposit money

src/allmende_payment_system/database.py

@@ -1,8 +1,9 @@
 import os
+
 from sqlalchemy import create_engine, select
 from sqlalchemy.orm import Session, sessionmaker
 
-from allmende_payment_system.models import User, Account, Transaction
+from allmende_payment_system.models import Account, Transaction, User
 
 SQLALCHEMY_DATABASE_URL = "sqlite:///./aps_db.db"
 engine = create_engine(SQLALCHEMY_DATABASE_URL)