Add link to the collatz conjecture

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Augusto 2021-06-08 11:44:20 +01:00
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### Instructions
Write a function, `CollatzCountdown`, that returns the number of steps necessary to reach 1 using the collatz countdown.
Write a function, `CollatzCountdown`, that returns the number of steps necessary to reach 1 using the [collatz countdown](https://en.wikipedia.org/wiki/Collatz_conjecture).
- It must return `-1` if `start` is equal to `0` or negative.