Create README.md

Author: olepinard

jupyter-notebooks/psscene-transition/README.md

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+# PSScene Transition
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+This document is was created for the August 23rd 2022 PSScene Migration Workshop (the recording link will be made available a day or two after the webinar).
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+The notebook runs through the changes that will occur to the Data, Orders and Subscription API. For each the changes are commented next to the old text. 
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+To use the notebook either have your API key stored as an environment variable($PL_API_KEY) or paste it as a string to replace to the `os.getenv('PL_API_KEY')`.
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+Extra info can be found in [this blog post](https://developers.planet.com/docs/apis/data/psscene3-4band-deprecation/) for what the specific asset types and bundle types will be changing to.