Corrected background image name and added the logo to the about menu.

app/PlaYUVerSubWindowHandle.cpp

@@ -1,6 +1,7 @@
 /*    This file is a part of PlaYUVer project
  *    Copyright (C) 2014-2018  by Joao Carreira   (jfmcarreira@gmail.com)
  *                                Luis Lucas      (luisfrlucas@gmail.com)
+ *                                Joao Santos     (joaompssantos@gmail.com)
  *
  *    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
@@ -44,7 +45,7 @@ class PlaYUVerMdiArea : public QMdiArea
 {
 public:
   PlaYUVerMdiArea( QWidget* parent = 0 )
-      : QMdiArea( parent ), m_pixmapLogo( ":/images/playuver-backgroud-logo.png" )
+      : QMdiArea( parent ), m_pixmapLogo( ":/images/playuver-background-logo.png" )
   {
     setBackgroundRole( QPalette::Background );
   }