Add copyright statements

frontend/src/App.vue

@@ -1,3 +1,23 @@
+<!--
+  - App.vue
+  - Copyright (c) 2022 james@firefly-iii.org
+  -
+  - This file is part of Firefly III (https://github.com/firefly-iii).
+  -
+  - 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/>.
+  -->
+
 <template>
   <router-view/>
 </template>