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

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

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+### Least common multiple (LCM)
+
+Use this lcm formula `lcm(a,b)=|a*b|/gcd(a,b)` for calculating the least common multiple of two numbers.
+Makes use of the [GCD snippet](https://github.com/Chalarangelo/30-seconds-of-code#greatest-common-divisor-gcd).
+
+```js
+const lcm = (x,y) => Math.abs(x*y)/(gcd(x,y));
+const gcd = (x, y) => !y ? x : gcd(y, x % y);
+// lcm(10,5) -> 10
+// lcm(12,7) -> 84
+```