Readme

16/02 update

1. Added a part to estimate the characteristic temperature
2. To compute external quantum efficiency: which $\lambda$ should we choose ? (the one corresponding to the mode with maximum power of a sort of mean value?)
3. Report: template. Fell free to modify or change. https://www.overleaf.com/8454814381zcrspzzcfdkb --> Link to overleaf file.