A few minor suggestions (mostly typo fixes)

[lnnrtwttkhn]

Hi @athms,

thanks for this great Deep Learning workshop! Unfortunately, I had to drop out after the practical exercise on Neural Networks and Backpropagation.

Anyway, I fixed a few minor typos along the way (see below).

Also, I ran the Jupyter Notebooks locally and included a few instructions how to do this in the README.md which might be helpful to others as well.

Finally, I added a .gitignore file to ignore the .ipynb_checkpoints.

Hope these changes are useful.

Overall, a great workshop with very well prepared materials, so thanks again!

Cheers,
Lennart