Add approximatelyEqual

snippets/approximatelyEqual.md

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+### approximatelyEqual
+
+Checks if two numbers are approximately equal to each other.
+
+Use `Math.abs()` to compare the absolute difference of the two values to `epsilon`.
+Omit the third parameter, `epsilon`, to use a default value of `0.001`.
+
+```js
+const approximatelyEqual = (v1, v2, epsilon = 0.001) => Math.abs(v1 - v2) < epsilon;
+```
+
+```js
+approximatelyEqual(Math.PI / 2.0 , 1.5708); // true
+```