Merge pull request #254 from exercism/grade-school-hint

Add HINTS for grade-school exercise
exercism · Dec 18, 2016 · 701ca30 · 701ca30
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+## Hints
+For this exercise the following F# feature comes in handy:
+- The [Map](https://en.wikibooks.org/wiki/F_Sharp_Programming/Sets_and_Maps#Maps) type associates keys with values. It is very similar to .NET's `Dictionary<TKey, TValue>` type, but with one major difference: `Map` is [immutable](https://fsharpforfunandprofit.com/posts/correctness-immutability/).