Add initialize2DArray

snippets/initialize2DArray.md

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+### initialize2DArray
+
+Initializes an 2D array of given width and height and value.
+
+Use `.map()` to generate h rows where each is a new array of size w initialize with value.
+
+```js
+const initialize2DArray = (w, h, val = null) => 
+  Array(h).fill().map(() => Array(w).fill(val));
+// initializeArrayWithRange(2, 2, 0) -> [[0,0], 
+//                                       [0,0]]
+```