Add README for running ResInsight with the experimental Workflow UI

README-experimental-workflow-ui.md

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+# Using the experimental Workflow UI
+
+The Workflow UI adds a **Workflows** node to the ResInsight project tree. It
+requires a Python environment containing `rips`, `taskmaestro`, and the
+workflow package.
+
+These instructions assume ResInsight is already installed and working.
+Python 3.12 or newer and Git are required.
+
+## 1. Create the Python environment
+
+Choose a permanent location for the environment and workflow files:
+
+```bash
+mkdir -p ~/resinsight-workflows
+python3 -m venv ~/resinsight-workflows/.venv
+source ~/resinsight-workflows/.venv/bin/activate
+python -m pip install --upgrade pip
+```
+
+Install `rips` from the `Python` directory supplied with ResInsight:
+
+```bash
+python -m pip install -e /path/to/ResInsight/Python
+```
+
+For a source checkout, use `/path/to/ResInsight/GrpcInterface/Python` instead.
+
+Clone and install the example workflows. This also installs `taskmaestro`:
+
+```bash
+git clone https://github.com/OPM/taskmaestro-resinsight.git \
+    ~/resinsight-workflows/taskmaestro-resinsight
+python -m pip install -e ~/resinsight-workflows/taskmaestro-resinsight
+```
+
+## 2. Register the workflows
+
+ResInsight discovers workflows in `~/.taskmaestro/workflows`:
+
+```bash
+mkdir -p ~/.taskmaestro/workflows
+for workflow in ~/resinsight-workflows/taskmaestro-resinsight/workflows/*/; do
+    ln -sfn "$(realpath "$workflow")" \
+        ~/.taskmaestro/workflows/"$(basename "$workflow")"
+done
+```
+
+## 3. Configure ResInsight
+
+Open **Edit → Preferences** and set:
+
+1. **Scripting → Python Executable Location** to the absolute path printed by:
+
+   ```bash
+   realpath ~/resinsight-workflows/.venv/bin/python
+   ```
+
+2. **Scripting → Enable Python Script Server** to on.
+3. **System → Experimental Features → Workflows** to on.
+
+Restart ResInsight. The **Workflows** node should now appear in the project
+tree. Select a workflow, provide its inputs, and click **Run**.
+
+## Troubleshooting
+
+- **No Workflows node:** Enable the experimental feature and restart
+  ResInsight.
+- **The Workflows node is empty:** Check that each directory under
+  `~/.taskmaestro/workflows` contains `workflow.yaml`, then restart ResInsight.
+- **A Python module cannot be found:** Confirm that **Python Executable
+  Location** points to the virtual environment created above.
+- **The workflow cannot connect:** Enable **Python Script Server** and restart
+  ResInsight.