Write tutorial on how to create a pull request

[datapythonista]

Understanding the steps to create a pull request is something tricky for people new to contributing to open source.

A short presentation is usually given at the beginning of the sprints. It'd be useful to have the same content, with more detail of explanations in a tutorial.

The easiest way to write a tutorial is probably to use a jupyter notebook, and export it to html. Please commit to .ipynb, so it can easily be modified later on.

You can use our slides as a reference:
https://docs.google.com/presentation/d/1LLhurGDEMYtPWy3sKQI8hwyhmNPgtwODOw2-J7iDlUI/edit#slide=id.g29300c84a0_0_58

[Cheukting]

I will give this a try as well