Add Syntax class, from step 157

src/Syntax.php

@@ -0,0 +1,24 @@
+<?php declare(strict_types=1);
+
+namespace Kilo;
+
+class Syntax {
+	public const HIGHLIGHT_NUMBERS = (1 << 0);
+
+	public string $filetype = '';
+	public array $filematch = [];
+	public int $flags = 0;
+
+	public static function new(string $name, array $extList, int $flags): self
+	{
+		$self = new self();
+
+		$self->filetype = $name;
+		$self->filematch = $extList;
+		$self->flags = $flags;
+
+		return $self;
+	}
+
+	private function __construct() {}
+}