added composer files and installed vendor packages. Also modified xsls to display base project

vendor/maennchen/zipstream-php/src/Exception/StreamNotSeekableException.php

@@ -0,0 +1,24 @@
+<?php
+
+declare(strict_types=1);
+
+namespace ZipStream\Exception;
+
+use ZipStream\Exception;
+
+/**
+ * This Exception gets invoked if a non seekable stream is
+ * provided and zero headers are disabled.
+ *
+ * @api
+ */
+class StreamNotSeekableException extends Exception
+{
+    /**
+     * @internal
+     */
+    public function __construct()
+    {
+        parent::__construct('enableZeroHeader must be enable to add non seekable streams');
+    }
+}