README-en.md edited online with Bitbucket

README-en.md

 3. The file `main.cpp` (in Sources) contains the function `main()` where you will be adding code. Open this file and study the code.
 
     ```cpp
-        QApplication a(argc, argv);
-        XYPlotWindow wLine;
-        XYPlotWindow wCircle;
+    QApplication a(argc, argv);
+    XYPlotWindow wLine;
+    XYPlotWindow wCircle;
         XYPlotWindow wHeart;
         XYPlotWindow wButterfly;