Add Seeding And Generating Random Integers as a reason til

reason/seeding-and-generating-random-integers.md

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+# Seeding And Generating Random Integers
+
+It is easy enough to generate a series of random numbers using the `Random`
+module's `int` function.
+
+```reason
+Random.int(10);
+```
+
+This will generate a random integer between 0 and 9.
+
+You may notice that the randomness is the same each time you run your
+program. That is because you have fixed seed. To make sure you have a
+different seed each time your program runs, you can initialize the random
+number generator with something different at each run, such as the current
+time.
+
+```reason
+Random.init(int_of_float(Js.Date.now()));
+```