Add icon on windows

qtox.pro

@@ -60,6 +60,7 @@ contains(JENKINS,YES) {
 
 # Rules for Windows, Mac OSX, and Linux
 win32 {
+    RC_FILE = windows/qtox.rc
     LIBS += -liphlpapi -L$$PWD/libs/lib -ltoxav -ltoxcore -ltoxencryptsave -lvpx -lpthread
     LIBS += -L$$PWD/libs/lib -lopencv_core248 -lopencv_highgui248 -lopencv_imgproc248 -lOpenAL32 -lopus
     LIBS += -lz -lopengl32 -lole32 -loleaut32 -luuid -lvfw32 -ljpeg -ltiff -lpng -ljasper -lIlmImf -lHalf -lws2_32

windows/qtox.rc

@@ -0,0 +1 @@
+IDI_ICON1               ICON    DISCARDABLE     "qtox.ico"