Add PMT file sample
Adds a PMT sample file as written by the Jpp K40 calibration routine. The file was taken from https://git.km3net.de/auxiliary_data/calibration/-/blob/main/00000117/pmt/_H_1.0.0/00013757/00013826/1.txt
Adds a PMT sample file as written by the Jpp K40 calibration routine. The file was taken from https://git.km3net.de/auxiliary_data/calibration/-/blob/main/00000117/pmt/_H_1.0.0/00013757/00013826/1.txt