Update README.md

Author: Tara-Lakshmipathy

README.md

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 # Visual Programming Interface
 The visual programmming interface `pyironflow` or `PyironFlow` is a gui skin based on [ReactFlow](https://reactflow.dev/) that currently works on top of `pyiron_workflow`. Theoretically, one could currently pack `pyiron_base` jobs into nodes for execution. The gui could also be extended to pack the workflow graph (extracted from the gui using `get_workflow()`) into a `pyiron_base` job for execution. An existing code-based workflow graph can be packed into the gui using `PyironFlow([wf])` where wf is the existing graph.
 
+User guide can be found [here](https://github.com/pyiron/pyironFlow/blob/main/docs/user_guide.md).
+
 ## Installation
 
 `conda install -c conda-forge pyironflow`