Add start of IconExtension class

src/Twig/Functions/IconExtension.php

@@ -0,0 +1,25 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Pcm\IconBundle\Twig\Functions;
+
+use Twig\Extension\AbstractExtension;
+use Twig\TwigFunction;
+
+final class IconExtension extends AbstractExtension
+{
+    /**
+     * @inheritDoc
+     */
+    public function getFunctions(): array
+    {
+        return [
+            new TwigFunction('icon', [$this, 'render'], [
+                'is_safe' => ['html']
+            ])
+        ];
+    }
+}
+
+