README-en.md edited online with Bitbucket

README-en.md

 4. Open the file `main.cpp` (you will not make changes in any other file in this project). Study the `main` function. You will NOT make changes to the `main` function. Note that the `main` function essentially does two things:
   
       i. Creates three birds and adds two of them to the window.
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       ii. Creates a timer that waits a second and after invokes the `birth` function passing by reference to the window and the three birds.
 
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