Initiale DAteien hinzugefuegt

app/database.py

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+from sqlalchemy import create_engine
+from sqlalchemy.ext.declarative import declarative_base
+from sqlalchemy.orm import sessionmaker
+from dotenv import load_dotenv
+
+load_dotenv()
+import os
+DB_URL = DB_URL = os.getenv("DB_URL")
+engine = create_engine(DB_URL,echo=True)
+SessionLocal = sessionmaker(autocommit=False,autoflush=False, bind=engine)
+
+Base = declarative_base()