[Streaming] Streaming data transfer and python integration (#6185)

streaming/python/README.rst

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+Streaming Library
+=================
+
+Dependencies:
+
+Install NetworkX: ``pip install networkx``
+
+Examples:
+
+- simple.py: A simple example with stateless operators and different parallelism per stage.
+
+Run ``python simple.py --input-file toy.txt``
+
+- wordcount.py: A streaming wordcount example with a stateful operator (rolling sum).
+
+Run ``python wordcount.py --titles-file articles.txt``