chore: update project structure and add testing framework

src/config/database.py

@@ -10,9 +10,10 @@ SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
 
 Base = declarative_base()
 
+
 def get_db():
     db = SessionLocal()
     try:
         yield db
     finally:
-        db.close() 
+        db.close()