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
+    ```cpp   
     QApplication a(argc, argv);
     XYPlotWindow wLine;
     XYPlotWindow wCircle;