add readme me doc

docs_helper/README.md

@@ -0,0 +1,12 @@
+# How to build the doc locally
+
+The GHA workflow is set to build the documentation and has more steps than
+the usual `mkdocs serve`. So if you want to see the documentation locally,
+you can use the following steps:
+
+1. Create a virtual environment and install the dependencies in `requirements-docs.txt` with python 3.11.
+2. Install dcm2bids within the virtual environment.
+3. Run `dcm2bids -h > docs_helper/help.txt && dcm2bids_helper -h > docs_helper/helper.txt && dcm2bids_scaffold -h > docs_helper/help_scaffold.txt`
+4. Run `mkdocs serve` to see the documentation locally.
+
+Note that this will only run the latest local version of the documentation. `mike` takes care of the versioning through the GHA workflow.