Add license header to all files

Change-Id: I24c88325af067ecd2442c10b8818a59273a07ff5
Gitlab: #45
diff --git a/client/src/components/Header.tsx b/client/src/components/Header.tsx
index 00d5ebb..303fc67 100644
--- a/client/src/components/Header.tsx
+++ b/client/src/components/Header.tsx
@@ -1,3 +1,20 @@
+/*
+ * Copyright (C) 2022 Savoir-faire Linux Inc.
+ *
+ * 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/>.
+ */
 import { Box, Button, Menu, MenuItem } from '@mui/material';
 import { MouseEvent, useState } from 'react';
 import { useNavigate, useParams } from 'react-router-dom';