Solution: Reverse the number guessing game

examples/arrays/reverse_number_guessing.html
```<!DOCTYPE html>
<html lang="en">
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=yes">

<title>Guess Number</title>
<body>

<button id="go">Start</button>
<button id="bigger">Bigger</button>
<button id="smaller">Smaller</button>
<button id="bingo">Bingo</button>

<div id="result"></div>

<script src="reverse_number_guessing.js"></script>

</body>
</html>

```

examples/arrays/reverse_number_guessing.js
```"use strict";

var guess = null;
var min = null;
var max = null;
var lower_limit = 1;
var upper_limit = 200;

function start_guessing() {
min = lower_limit;
max = upper_limit;
show();
}
function guess_smaller() {
max = guess;
show();
}
function guess_bigger() {
min = guess;
show();
}

function bingo() {
document.getElementById('result').innerHTML = "Yeah!";
return false;
}

function show() {
guess = Math.round((max+min)/2);
document.getElementById('result').innerHTML = guess;
return false;
}