Create hints.md

Author: quintuple-mallard

exercises/concept/captains-log/docs/hints.md

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+# Hints
+
+## 1. Generate a random starship registry number
+  - To generate a random number in the range _min_ (inclusive) to _max_ (exclusive) you can use the snippet `min + Math.random()*(max - min)`.
+  - There is a [built in function][floor] for turning a floating point number into an integer.
+##  2.Generate a random stardate
+ - To generate a random number in the range _min_ (inclusive) to _max_ (exclusive) you can use the snippet `min + Math.random()*(max - min)`.
+## 3. Generate a random planet
+- You can use a randomly generated integer as an array index.
+  
+[floor]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/floor