Added license information in the README.
The music.py file is just here for TODO purpose, it is not working yet.

Basic code to handle necessary opengl objects for 3d_view.py.

The code should be able to handle 3 electrodes for R, G and B. Didn't
test it so far (need 2 other electrodes).

Computed value could be outside range [0, 255]. Now, it won't.