Document possible cell tags

Author: FlorentinD

examples/README.adoc

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+# Examples
+
+This folder contains example notebooks on how to use the `graphdatascience` python client.
+
+
+## Custom tooling for notebooks
+
+As for the rest of this repository, you can run `../scripts/makestyle` and `../scripts/checkstyle` to apply and check the style of the notebook.
+By default, `makestyle` will remove all cell outputs. If you want to preserve some outputs, tag the cell with `preserve-output`.
+
+To generate documenatation, you can run `../scripts/nb2doc/convert`.
+
+If you only want to let CI run the notebook given a certain condition, tag a given cell in the notebook with `verify-version`.
+As the name suggests, the tag was introduced to only run for given GDS server versions.
+To make sure certain cells are run even in case of failure, tag the cell with `teardown`.