Add other class for kaddressbook domain

kaddressbook/src/domain/CMakeLists.txt

-set(kaddressbook_domain_SRCS contactgroup.cpp)
+set(kaddressbook_domain_SRCS contactgroup.cpp contact.cpp)
 
 add_library(kaddressbookdomain ${kaddressbook_domain_SRCS})
 generate_export_header(kaddressbookdomain BASE_NAME kaddressbookdomain)

kaddressbook/src/domain/contact.cpp

+/*
+  This file is part of KAddressBook.
+
+  Copyright (c) 2016 Laurent Montel <montel@kde.org>
+
+  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 2 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, write to the Free Software Foundation, Inc.,
+  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+*/
+
+
+#include "contact.h"
+
+using namespace Domain;
+
+Contact::Contact()
+{
+
+}

kaddressbook/src/domain/contact.h

+/*
+  This file is part of KAddressBook.
+
+  Copyright (c) 2016 Laurent Montel <montel@kde.org>
+
+  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 2 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, write to the Free Software Foundation, Inc.,
+  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+*/
+
+
+#ifndef CONTACT_H
+#define CONTACT_H
+
+namespace Domain
+{
+class Contact
+{
+public:
+    Contact();
+};
+}
+
+#endif // CONTACT_H