Add hints for grains test (#234) (#241)

robkeim · ErikSchierboom · commit 8e2bc9e3839b · 2016-12-12T08:00:58.000+01:00
diff --git a/exercises/grains/HINTS.md b/exercises/grains/HINTS.md
@@ -0,0 +1,3 @@
+## 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)

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,3 @@`
	`1`	`+## Hints`
	`2`	`+For this exercise the following F# feature comes in handy:`
	`3`	`+- [BigInt](https://msdn.microsoft.com/en-us/visualfsharpdocs/conceptual/numerics.biginteger-structure-%5Bfsharp%5D)`