added www

www/test_db.php

@@ -0,0 +1,13 @@
+<?php
+$link = mysqli_connect("database", "root", $_ENV['MYSQL_ROOT_PASSWORD'], null);
+
+if (!$link) {
+    echo "Error: Unable to connect to MySQL." . PHP_EOL;
+    echo "Debugging errno: " . mysqli_connect_errno() . PHP_EOL;
+    echo "Debugging error: " . mysqli_connect_error() . PHP_EOL;
+    exit;
+}
+
+echo "Success: A proper connection to MySQL was made! The docker database is great." . PHP_EOL;
+
+mysqli_close($link);