added desktop file and icon

data/ximper-unified-theme-switcher-gui.desktop

+[Desktop Entry]
+Type=Application
+Name=Theme switcher
+Name[ru]=Смена тем
+Comment=Color theme management
+Comment[ru]=Управление цветовой темой
+Categories=Utility;
+Exec=ximper-unified-theme-switcher-gui
+Icon=ximper-unified-theme-switcher-gui

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