first attempt to make About window

ui/widgets/about.h

@@ -0,0 +1,43 @@
+// Squawk messenger. 
+// Copyright (C) 2019  Yury Gubich <blue@macaw.me>
+// 
+// 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 <http://www.gnu.org/licenses/>.
+
+#ifndef ABOUT_H
+#define ABOUT_H
+
+#include <QWidget>
+#include <QScopedPointer>
+#include <QApplication>
+
+namespace Ui
+{
+class About;
+}
+
+/**
+ * @todo write docs
+ */
+class About : public QWidget
+{
+    Q_OBJECT
+public:
+    About(QWidget* parent = nullptr);
+    ~About();
+
+private:
+    QScopedPointer<Ui::About> m_ui;
+};
+
+#endif // ABOUT_H