Merge pull request #197 from Pl4gue/patch-1

Create least-common-multiple-(LCM).md

snippets/least-common-multiple-(LCM).md

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+### Least common multiple (LCM)
+
+Use the greatest common divisor (GCD) formula and `Math.abs()` to determine the least common multiple.
+The GCD formula uses recursion.
+
+```js
+const lcm = (x,y) => {
+  const gcd = (x, y) => !y ? x : gcd(y, x % y);
+  return Math.abs(x*y)/(gcd(x,y));
+};
+// lcm(12,7) -> 84
+```