Implemented PeerMetadata Manager & Telegram User Metadata manager

src/FederationLib/Exceptions/Standard/PeerMetadataNotFoundException.php

@@ -0,0 +1,19 @@
+<?php
+
+namespace FederationLib\Exceptions\Standard;
+
+use Exception;
+use FederationLib\Enums\Standard\ErrorCodes;
+use Throwable;
+
+class PeerMetadataNotFoundException extends Exception
+{
+    /**
+     * @param string $message
+     * @param Throwable|null $previous
+     */
+    public function __construct(string $message = "", ?Throwable $previous = null)
+    {
+        parent::__construct($message, ErrorCodes::PEER_METADATA_NOT_FOUND, $previous);
+    }
+}