143 data pipeline tutorial

[reheinrich]

I have created a tutorial on how to use the GADME data pipeline. This tutorial should help people to easily integrate the GADME pipeline into external repositories. The tutorial also describes the many different configuration options of the GADME data pipeline.

Further customizations:

• Linking the tutorial to README.md
• Restructuring of the notebooks folder --> separation into development notebooks and tutorial notebooks

[raphaelschwinger]

@reheinrich Great work, really comprehensive and well written. Only the cache_dir was set to be in the tutorial folder, I changed this to the data_gadme folder. Most users will cloned the repo and then the files will already be downloaded to the default directory as set in the configs. 9e6e5ebbbb7ffe3035f18f8bdbc8d8e92b8f49d3

Other than that I added your parameter descriptions as pydoc, so we have them in intelisense too :) 303a49e5715f3636b68cf029c814d4a9fb2c8986