First example, merging [1] and [2]

[1] http://pyqt.sourceforge.net/Docs/PyQt5/python_shell.html
[2] https://en.wikipedia.org/wiki/PyQt#Hello_world_example

Signed-off-by: Rodrigo Oliveira <rodrigo@simb.com.br>
Second example; simple window with an input box, a button and a message

http://www.thehackeruniversity.com/2014/01/23/pyqt5-beginner-tutorial/

Signed-off-by: Rodrigo Oliveira <rodrigo@simb.com.br>
Third example; simple address book

http://www.thehackeruniversity.com/2014/01/26/pyqt5-beginner-tutorial-part-2/

Signed-off-by: Rodrigo Oliveira <rodrigo@simb.com.br>
Another example; simple notepad (only read function)

http://www.thehackeruniversity.com/2014/02/20/pyqt5-beginner-tutorial-part-3/

Signed-off-by: Rodrigo Oliveira <rodrigo@simb.com.br>