Add hello world and crud benchmarks

Author: steevanb

.gitignore

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+config.php
+.idea/

crud.php

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+<?php
+
+declare(strict_types=1);
+
+require('config.php');
+
+function error_500(string $message): void
+{
+    header('HTTP/1.1 500 Internal Server Error');
+    exit($message);
+}
+
+function show_mysqli_error(mysqli $mysqli, int $line): void
+{
+    if ($mysqli->error) {
+        error_500('[' . $line . '] ' . $mysqli->error);
+    }
+}
+
+$mysqli = new mysqli($host, $user, $password, $database);
+if ($mysqli->connect_error) {
+    error_500($mysqli->connect_error);
+}
+
+// create
+$mysqli->query("
+    INSERT INTO crud (firstName, lastName, email, message)
+    VALUES ('Steevan', 'BARBOYON', 'steevan.barboyon@gmail.com', 'php-benchmarks, the first php benchmarks site !')
+");
+show_mysqli_error($mysqli, __LINE__);
+$id = $mysqli->insert_id;
+
+// read
+$mysqli->query('SELECT * FROM crud WHERE id = ' . $id);
+show_mysqli_error($mysqli, __LINE__);
+
+// update
+$mysqli->query("
+    UPDATE crud
+    SET firstName = 'InfoDroid', lastName = 'InfoDroid', email = 'contact@info-droid.fr', message = 'php-benchmarks, the ultimate php benchmarks site !'
+    WHERE id = " . $id
+);
+show_mysqli_error($mysqli, __LINE__);
+
+// delete
+$mysqli->query('DELETE FROM crud WHERE id = ' . $id);
+show_mysqli_error($mysqli, __LINE__);
+
+$mysqli->close();

helloworld.php

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+<?php
+
+declare(strict_types=1);
+
+echo 'Hello World !';