Noissue - Add missing license headers in adblockplusui repository

skin/devtools-panel.css

Index: skin/devtools-panel.css
===================================================================
--- a/skin/devtools-panel.css
+++ b/skin/devtools-panel.css
@@ -1,8 +1,25 @@
+/*
+ * This file is part of Adblock Plus <https://adblockplus.org/>,
+ * Copyright (C) 2006-present eyeo GmbH
+ *
+ * Adblock Plus is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 3 as
+ * published by the Free Software Foundation.
+ *
+ * Adblock Plus 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Adblock Plus.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
 *
 {
   font-family: 'Lucida Grande', 'Segoe UI', Ubuntu, Tahoma, Arial, sans-serif;
   font-size: 11px;
   box-sizing: border-box;
 }
 
 html