Initial placeholder README.md file

Author: frreiss

README.md

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+# ray-pipeline
+
+*Part of the CodeFlare project.*
+
+The `ray-pipeline` library provides facilities for defining and running parallel pipelines on top of [Ray](https://ray.io). The goal of this project is to unify pipeline workflows across multiple platforms such as [scikit-learn](https://scikit-learn.org/) and [Apache Spark](https://spark.apache.org/), while providing nearly optimal scale-out parallelism on pipelined computations.
+
+## Release status
+
+This project is under active development. Keep an eye on this page for our first public release!
+
+See the [design document](https://docs.google.com/document/d/1t1K8N07TcbBKBgrcI6jf9tPow00cOKE9whnEVxOd4-U/edit) for more information on our design goals.
+
+## Example notebooks
+
+**TODO:** Add instructions for running the notebooks in the `notebooks` directory.
+
+## Building
+
+**TODO:** Add instructions for building from source once `setup.py` has been cleaned up.
+
+## Contributing
+
+**TODO:** Create a `CONTRIBUTING.md` file and add high-level instructions here
+
+## Running tests
+
+TODO: Fill out this sectionce we have