added link to notebook

.gitignore

 /**/.DS_Store
 /**/*.py[cod]
 /**/__pycache__
-/.ipynb_checkpoints
 /.idea/
 /test/__pycache__
\ No newline at end of file

docs/.gitignore

+docs/notebooks/.ipynb_checkpoints/
 !.gitignore
 !User_manual.docx

docs/notebooks/mdf_reader_test_overview.ipynb

@@ -2151,7 +2151,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "To learn how to construc a schema or data model for a particular deck/source, visit this other tutorial. INSERT LINK TO NEXT NOTEBOOK"
+    "To learn how to construc a schema or data model for a particular deck/source, visit this other tutorial: [create_data_model.ipynb](https://git.noc.ac.uk/brecinosrivas/mdf_reader/-/blob/master/docs/notebooks/create_data_model.ipynb)"
    ]
   }
  ],