Add copyright notice to test source

src/test/startup_test.cpp

@@ -1,3 +1,26 @@
+/*
+ * Copyright 2023-2024 Simon Vetter
+ * 
+ * This file is part of PeakAscentLogger.
+ * 
+ * PeakAscentLogger is free software: you can redistribute it and/or modify it under the terms
+ * of the GNU General Public License as published by the Free Software Foundation,
+ * either version 3 of the License, or (at your option) any later version.
+ * 
+ * PeakAscentLogger 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 PeakAscentLogger.
+ * If not, see <https://www.gnu.org/licenses/>.
+ */
+
+/**
+ * @file startup_test.cpp
+ * 
+ * This file defines the startup test cases.
+ */
+
 #include <QCoreApplication>
 #include <QtTest>