Add initial Prefect flow

.gitignore

@@ -0,0 +1,2 @@
+__pycache__/
+*.pyc

test_flows/hello_world.py

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+from prefect import flow, task
+import time
+
+@task
+def say_hello(name: str) -> str:
+    message = f"Hello, {name}!"
+    print(message)
+    return message
+
+@flow(name="example-flow")
+def example_flow(name: str = "World"):
+    result = say_hello(name)
+    time.sleep(2)  # Simuliere Arbeit
+    return result
+
+if __name__ == "__main__":
+    example_flow()