Update README.md

Author: Ben-Epstein

README.md

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 # prefect-modal
 A simple example of configuring prefect workflows on modal serverless compute
 
+See the [accompanying guide](https://smiling-galliform-8d3.notion.site/Prefect-on-Modal-1912909a140e80d29ac7dd72558f3f3c?pvs=74)
+
 Install uv to get started: https://docs.astral.sh/uv/getting-started/installation/