[READY] Add new notebook example to docs about adding Kedro to a notebook project

docs/examples/add_kedro_to_spaceflights_notebook/README.md

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+# How to extract notebook content to markdown
+
+To publish `add_kedro_to_a_notebook.ipynb` in the Kedro docs, follow these steps.
+
+1. In your virtual environment: `pip install jupytext`
+2. In the notebook folder: jupytext --set-formats ipynb,md <notebook_name>.ipynb
+3. Move the resultant markdown to the appropriate docs folder
+
+
+The two steps above create a markdown file with a copy of the contents of the notebook, and we may be able to automate this step as per https://jupytext.readthedocs.io/en/stable/config.html but it's beyond my level of knowledge.