changed project structure and splited models and routes files

src/app/database.py

@@ -0,0 +1,14 @@
+from sqlmodel import create_engine, SQLModel, Session
+from decouple import config
+
+# Get database configuration
+DATABASE_URL = config('DATABASE_URL', cast=str, default='sqlite:///./bookapi.db')
+
+# Create database engine
+engine = create_engine(str(DATABASE_URL), echo=True)
+# SQLModel.metadata.create_all(engine)
+
+# Get database session
+def get_session():
+    with Session(engine) as session:
+        yield session