make task 1 simpler

[jcolomb]

I love the idea to get a document in markdown for the first task, I like the idea that this document could be expanded later, but I think it is too difficult (and fuzzy, where and how to write that ?) to start from scratch, it is probably a great task, but not as the first one.

We can discuss this, but I would like to move it to a later task, and start with something easier, lasting less than 10 minutes, what about:

• introduce yourself on slack
• introduce yourself in a github issue (to use markdown
• a bit of both: making a issue on github and see it appear on slack (we would need to add github application on slack)