Add CSI

[sebaminguez]

Please add CSI next to SPI and CPI
CSI = CPI * SPI
CSI> 0.9 OK Project
CSI Between 0.8 and 0.9 There are possibilities to fix
CSI <0.8 Most likely not fix.

Thanks and congrats, great work!

[gamafranco]

@sebaminguez, thanks for this suggestion.

It seems to make sense, but I need a reference to confirm if and how it can be added to the project.

Can you provide a good one? Thanks.