Add exercise topics to config

I noticed today that none of the exercises in the config have any topics listed. Not an urgent issue, but it might be good to add some.

Should make for a super easy fix because the xcsharp track already has valid topics listed in their config. IMO this would be a good good first patch issue.

Upon further reflection, I have realized that it may not be good to just copy topics from other tracks. Rather, I think it would be better for contributors to come up with and agree on topics for exercises.

For reference, valid topics are listed here

[jtigger]

Yes, @Smarticles101… will love to incorporate topics. Yeah, and I agree that each language may trigger different topics depending on their features (that said, C# and Java are very similar in feature set). Also, I’ve noticed that all that can really be said about an exercise is what kind of problem it is. It’s the solutions that invoke different language features — how people choose to solve them.

I am not aware of a feature that draws on this data, either. I suspect that the redesign will directly address the gap between a series of exercises and an actual curriculum.

For more context, digest the discussion: “Problem ordering, topics covered, and understanding of concepts required” — exercism/discussions#60.

[stkent]

Putting this back on hold while upstream decisions get made.