Add new exercise : Affine cipher

[TomPradat]

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[TomPradat]

I'll work on this

[neenjaw]

Sounds good, @TomPradat are you familiar with the effort to make version 3 of exercism? There is a good opportunity to write content or exercises there too (which would be a big help)!

See this list of issues: https://github.com/exercism/v3/issues?q=is%3Aissue+is%3Aopen+%22%5BJavascript%5D%22+no%3Aassignee+

[TomPradat]

Not really, i'll check it out :).

With v3, will the exercises of this repo be moved to the v3 ? In other words, is it useful to implement exercises here too ?

[neenjaw]

They will get ported to v3, but the big change in v3 is to let exercises from v2 just to be about practice rather than about teaching JavaScript. So v3-specific exercises aim more to teach a single concept in JavaScript than attempt to solve an open ended problem.