Add license info at Friendica PHP files

src/Network/HTTPException.php

@@ -1,4 +1,27 @@
 <?php
+/**
+ * @copyright Copyright (C) 2020, Friendica
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ */
+
+namespace Friendica\Network;
+
+use Exception;
 
 /**
  * Throwable exceptions to return HTTP status code
@@ -6,11 +29,6 @@
  * This list of Exception has been extracted from
  * here http://racksburg.com/choosing-an-http-status-code/
  */
-
-namespace Friendica\Network;
-
-use Exception;
-
 abstract class HTTPException extends Exception
 {
 	public $httpdesc = '';