Add fizzbuzz description

Author: 403-html

fizzbuzz/README.md

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+# FizzBuzz array
+
+FizzBuzz is the "Hello World" of technical interview questions. Your function should write the numbers from 1 to n with a twist; instead of any multiplier of 3, you output Fizz, instead of multiplers of 5 you output Buzz, and if they happen at the same time, you should use FizzBuzz. The output of your function should be a mixed array of numbers and strings.
+
+> Description found in [javascript.onl](https://javascript.onl/problems/1.html)