add instructions for week 2 day 5

[edduardoo]

Hi Ed. Great course!

This PR is a suggestion to add instructions for executing the lab for week 2 day 5. One thing I love about your course is the ability to watch the videos without stopping to follow along. Sometimes I watch all the week's videos on my phone and then later, when I have a chance, I explore the labs on my computer.

In this scenario, having the instructions the same as we do for the previous labs is very helpful so people don't need to go back to the video.

I've added it outside of the community contributions folder because it's supposed to be part of the main course instructions. But please let me know if this is not the right way of doing it.

Lastly, it's totally fine if you don't think this is useful. Feel free to disregard the PR in this case, no worries.