Added chapter on sets

[AndrewPluzhnikov]

Hello,

I wrote a chapter introducing sets.

Please let me know if you'd like me to change or add anything.

[alexmojaki]

Hello,

Thank you for being willing to contribute to futurecoder! It's always great to have new contributors. I'm also very impressed that you learned how course content is implemented and wrote a whole chapter, that looks like a lot of work.

Unfortunately I don't think I can use this right now. I see several issues with how this is written. I don't want to list them all, but one example is that it uses many concepts that haven't been taught elsewhere in the course, such as:

• Multiple arguments to range and print
• Tuples
• Comments
• Imports
• Formatting

I mentioned in https://github.com/alexmojaki/futurecoder/blob/master/how_to_contribute.md#helping-with-course-content that I prefer for people to make a proposal draft in markdown before trying to implement anything. Maybe I should add some extra clarity/emphasis to that point. It's not just that implementing content is technically tricky. I also don't want people to go through the effort of implementing course content too soon, to prevent this kind of thing. I'm sorry that wasn't clear.

But there's a bright side! Since you've learned how to implement course content, you can help with #363. Adding a chapter on dicts is a much higher priority than sets. The content is already written, it just needs to be implemented. I was procrastinating doing that myself and didn't expect that anyone else would be able to, so having help would be great. Are you interested?

[AndrewPluzhnikov]

Alex,
I'd like to go ahead and implement the chapter on dictionaries.
I will comment on the other issue(#363) with some questions.