Add missing license header

Signed-off-by: schroedtert <t.schroedter@fz-juelich.de>

include/pMessageBox.h

+/*
+ * PeTrack - Software for tracking pedestrians movement in videos
+ * Copyright (C) 2010-2020 Forschungszentrum Jülich GmbH,
+ * Maik Boltes, Juliane Adrian, Ricardo Martin Brualla, Arne Graf, Paul Häger, Daniel Hillebrand,
+ * Deniz Kilic, Paul Lieberenz, Daniel Salden, Tobias Schrödter, Ann Katrin Seemann
+ *
+ * This program 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.
+ *
+ * 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://cdwww.gnu.org/licenses/>.
+ */
+
 #ifndef PMESSAGEBOX_H
 #define PMESSAGEBOX_H
 

src/pMessageBox.cpp

+/*
+ * PeTrack - Software for tracking pedestrians movement in videos
+ * Copyright (C) 2010-2020 Forschungszentrum Jülich GmbH,
+ * Maik Boltes, Juliane Adrian, Ricardo Martin Brualla, Arne Graf, Paul Häger, Daniel Hillebrand,
+ * Deniz Kilic, Paul Lieberenz, Daniel Salden, Tobias Schrödter, Ann Katrin Seemann
+ *
+ * This program 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.
+ *
+ * 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://cdwww.gnu.org/licenses/>.
+ */
+
 #include "pMessageBox.h"
 
 #include <QGridLayout>