add part 2

[dopplerchase]

I have added in the part 2 google colab notebooks now.

I have also put the notebooks into different directories. Hopefully thats okay

[FussyDuck]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}