exercises(list-ops): implement

[Norbiox]

I have added missing exercise "list-ops" according to my proposition in this thread on forum. Unfortunately I have failed to provide 2 tests and solutions for them - it's about handling nested lists in concatenate and reverse. I've tried generics but found no working solutions. I also looked at implementations of this task in other statically typed languages, but they've been missing those cases too. As I'm pretty new to statically typed languages I need to deepen my understanding of that topic.

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[ee7]

Thanks. I took the liberty of pushing a first set of changes to your branch.

This is not yet ready to merge. I still want to at least:

• [ ] Review the implemented test cases
• [ ] Consider making append append in place
• [ ] Consider avoiding built-in functions in the example, replacing add with append, and len with length

[Norbiox]

I should've read the canonical-data.json first I see. Somehow I missed it in introduction video.

To example.nim: I've used seq everywhere, but it was refactored to the point that It's not my PR anymore.

[siebenschlaefer]

Oh, I'm sorry to hear that.

[Norbiox]

Me too