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Exercism exercises in Haskell.

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Adds concept exercise Guessing Game for concept Pattern Matching. Closes #1092 and fixes my mess in PR #1094

The result type of the `proteins` function is `Maybe [String]` but all tests expect `Just`. I added some tests that expect `Nothing` on an invalid input.

This is my WIP w.r.t. #1103.

@MatthijsBlom suggested the following concept graph, which is a good starting point for building up to a basic understanding of proper pattern matching in Haskell. ``` | Simple Pattern Matching...

The goal of this issue is to come up with a code example that can be used as the basis for an exercise that introduces `case-expressions` in Haskell. A few...

on hold

## Issue: The technical requirements and best practices information for contributing exercises and concepts is spread throughout multiple files in the site. This makes contributing more difficult than necessary and...

At the moment, the Haskell track allows editing the `package.yaml`. Yes, it is unclear that any version (using a version constraint) wouldn't work, since a specific version of Stackage is...

We'd like to introduce pattern matching, and we think Guessing Game is a suitable story for this: https://exercism.org/docs/building/tracks/stories/pattern-matching-number-guessing-game Both Elixir and F# have implemented this exercise, so it's worth taking...

Improved readability of the first paragraph.

https://github.com/exercism/haskell/blob/main/README.md#directory-structure and https://github.com/exercism/haskell/blob/main/README.md#exercise-structure didn't get updated for v3. * Update both of these to add .meta/config.json and .docs/instructions.md. * Update the "Exercise structure" heading (and potentially any text) to make...