Add Creating A 2D Array as a reason til

reason/creating-a-2d-array.md

@@ -0,0 +1,36 @@
+# Creating A 2D Array
+
+In most languages if I wanted to create a two-dimensional array, I would
+utilize some nested looping construct to generate columns of rows. The
+[ReasonML `Array` module](https://reasonml.github.io/api/Array.html)
+abstracts this away.
+
+```reason
+let grid = Array.make_matrix(10, 10, 0);
+
+grid
+|> Array.iter(column => {
+  column
+  |> Array.iter(cell => {
+    print_int(cell);
+  });
+  print_endline("");
+});
+
+/*
+0000000000
+0000000000
+0000000000
+0000000000
+0000000000
+0000000000
+0000000000
+0000000000
+0000000000
+0000000000
+*/
+```
+
+The `make_matrix` function allows you to specify dimensions of a
+two-dimensional array with all positions initialized to the same value --
+that third argument.