feat(challenges): add fizzbuzz

challenges/fizzbuzz/README.md

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+# fizzbuzz
+
+Created by [@Divlo](https://github.com/Divlo) on 30 June 2021.
+
+## Instructions
+
+Write a program that print the numbers from 1 to `n` but:
+
+- if number is divisible by 3, print `Fizz`
+- if number is divisible by 5, print `Buzz`
+- if number is divisible by both 3 and 5, print `FizzBuzz`
+- otherwise print the number
+
+## Examples
+
+### Example 1
+
+#### Input
+
+```txt
+5
+```
+
+#### Output
+
+```txt
+1
+2
+Fizz
+4
+Buzz
+```
+
+See the `test` folder for examples of input/output.