ExifReaderFactory.php: add exif reader factory map

inc/Data/Driver/Metadata/ExifReaderFactory.php

@@ -0,0 +1,15 @@
+<?php
+namespace Vichan\Data\Driver;
+
+
+class ExifReaderFactory {
+	private array $mime_to_reader;
+
+	public function __construct(array $mime_to_reader) {
+		$this->mime_to_reader = $mime_to_reader;
+	}
+
+	public function getReader(string $mime): ?ExifReader {
+		return $this->mime_to_reader[$mime] ?? null;
+	}
+}