I haven’t actually looked at Exercism yet, how would your idea differ specifically?
Not exercise based, but we are thinking about starting a glossary section which could help with Elixir and functional specific areas 
May also be worth looking at https://elixirforum.com/t/seeking-contributors-for-elixir-quiz/16239and perhaps also contacting @doomspork as I’m sure they’ve discussed adding exercises (or may even already have them) over at ElixirSchool (self-published) (free)
