NB3012.md

+[link to practical](https://mybinder.org/v2/git/https%3A%2F%2Fgitlab.tudelft.nl%2Faj-lab%2Fteaching.git/ff91e706a2f1ced9cc24c65a9aad5a6bf5d30cf7?filepath=binder%2Fnb3012_practical_em.ipynb)
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