App Engine: add a setup step in README #2611
Merged
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Two service accounts are used in this tutorial. One belongs to Cloud Pub/Sub to allow it to generate auth tokens, the other belongs to push messages delivered to the push endpoint for auth and authz purposes.
This PR clarifies the differences between them.
To view the changed file: https://github.com/GoogleCloudPlatform/python-docs-samples/blob/961d16ae98ee82f2467fc3dd228a13bbe22756eb/appengine/standard_python37/pubsub/README.md