Add hints for grains test (exercism#234)

robkeim · Dec 11, 2016 · ad76965 · ad76965
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+## Hints
+For this exercise the following F# feature comes in handy:
+- [BigInt](https://msdn.microsoft.com/en-us/visualfsharpdocs/conceptual/numerics.biginteger-structure-%5Bfsharp%5D)